The Trinity in the New Testament: The Baptism, the Great Commission, and the Apostolic Letters
This is Part 3 of a 7-part series: The Holy Trinity — Answering Jehovah’s Witnesses.
Introduction
In Part 2, we saw that the Old Testament already contains the seeds of Trinitarian revelation — in the plural language of Genesis, the Angel of the LORD, Isaiah’s Trisagion, and Psalm 110. Now in Part 3, we come to the New Testament, where the full flowering of that revelation bursts into the open.
The New Testament does not invent the Trinity. It reveals it. The same God who spoke through the prophets has now spoken through His Son (Heb. 1:1–2), and in doing so, the Three who were veiled in the Old Testament now stand in full light: the Father sending, the Son sent and incarnate, the Holy Spirit poured out upon all flesh.
In this post we will examine the key New Testament passages that together form the biblical foundation of the Trinity doctrine — passages that cannot be explained away, translated around, or reduced to anything less than what they say.
1. The Baptism of Jesus: All Three Persons at Once
The baptism of Jesus in Matthew 3:16–17 is the New Testament’s most vivid single display of the Trinity:
“And when Jesus was baptized, immediately he went up from the water, and behold, the heavens were opened to him, and he saw the Spirit of God descending like a dove and coming to rest on him; and behold, a voice from heaven said, ‘This is my beloved Son, with whom I am well pleased.'” (Matt. 3:16–17)
All three Persons of the Trinity are present simultaneously:
The Son — Jesus, being baptized, standing in the water
The Holy Spirit — descending visibly like a dove upon the Son
The Father — speaking audibly from heaven, identifying and affirming the Son
This destroys two errors at once. The Father, Son, and Spirit are not the same Person wearing different masks (that would be Modalism) — they are visibly, simultaneously distinct. And yet there is one God here, not three competing deities. The Father does not become the Spirit; the Spirit does not become the Son. Three Persons, one God, one moment.
No honest reading of Matthew 3:16–17 can conclude that Jesus is merely a created angelic being who is receiving divine approval from his creator. The scene is Trinitarian to its core.
2. The Great Commission: One Name, Three Persons
We examined Matthew 28:19 in Part 1, but it deserves deeper treatment here:
“Go therefore and make disciples of all nations, baptizing them in the name [singular] of the Father and of the Son and of the Holy Spirit.” (Matt. 28:19, ESV)
The Greek word for “name” here is onoma — singular. Jesus does not say “in the names” (plural) of three separate beings. He says “in the name” (singular) that belongs jointly to Father, Son, and Holy Spirit. Three Persons, one divine Name.
In the Old Testament, the divine Name — YHWH — was the unique name of the one God of Israel. When Jesus places the Son and the Holy Spirit alongside the Father within that singular Name, He is doing something extraordinary: He is identifying all three as sharing equally in the one divine nature. This is why Christians have been baptized in this Trinitarian formula since the very beginning of the church — because the commission to do so came from Jesus Himself.
3. John 1:1–3, 14 — The Word Is God and Became Flesh
“In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God. All things were made through him, and without him was not any thing made that was made… And the Word became flesh and dwelt among us.” (John 1:1–3, 14, ESV)
The Prologue of John’s Gospel is one of the most theologically dense passages in all of Scripture. Four truths are stacked together:
“In the beginning was the Word” — the Word pre-existed creation. He was already there when “the beginning” began.
“The Word was with God” — the Word is personally distinct from God the Father. “With” implies a face-to-face relationship, genuine distinction between two persons.
“The Word was God” — the Word is fully divine, sharing the divine nature of the Father. Not a god, not a lesser deity, but God.
“The Word became flesh” — this eternal, divine Word took on human nature in the person of Jesus of Nazareth.
The Watchtower’s New World Translation renders verse 1c as “the Word was a god” — inserting an indefinite article that does not exist in the Greek text. We will address this translation abuse in depth in Part 4. For now, note that John 1:18 calls Jesus the “only begotten God” (monogenes theos), and John 20:28 records Thomas worshipping Jesus as “My Lord and my God” — with no correction from Jesus.
4. John 10:30 — “I and the Father Are One”
“I and the Father are one.” (John 10:30, ESV)
Jesus’ audience — expert Jewish readers of the Old Testament — immediately understood what this statement meant. They picked up stones to kill Him for blasphemy (v. 31). When Jesus asked why, they answered: “because you, being a man, make yourself God” (v. 33). Jesus did not correct them by saying, “No, no — I only meant we are unified in purpose.” He engaged their accusation directly and defended His claim.
The Greek word for “one” here is hen — neuter, not masculine. Jesus is not saying “I and the Father are one Person” (that would be Modalism). He is saying “I and the Father are one thing” — one in essence, one in nature, one in divine Being. This is the language of ontological unity, not merely relational agreement.
5. John 20:28 — Thomas: “My Lord and My God!”
After the resurrection, the disciple Thomas — who had doubted — encounters the risen Jesus and responds with the most direct declaration of Christ’s deity in the entire New Testament:
Thomas answered him, “My Lord and my God!” (John 20:28, ESV)
Thomas addresses Jesus directly as God. This is not a general exclamation. The grammar is clear: Thomas is speaking to Jesus and calling Him “my God.” And Jesus responds — not with a correction (“Thomas, I am not God — don’t say that!”) but with a blessing: “Have you believed because you have seen me? Blessed are those who have not seen and yet have believed” (v. 29).
Jesus accepts Thomas’ worship and confession. If Jesus were not God — if He were merely a created angelic being as the Watchtower teaches — this would have been the perfect moment to correct one of His closest disciples. Instead, He receives the confession as true and blesses those who share it without having seen.
6. Colossians 2:9 — The Fullness of Deity
“For in him the whole fullness of deity dwells bodily.” (Col. 2:9, ESV)
The Greek word translated “fullness of deity” is pleroma tes theotetos — the complete, entire, undivided totality of the divine nature. Paul is not saying Jesus has some divine qualities, or a share of divinity, or a divine commission. He is saying that everything God is, dwells fully and completely in the person of Jesus Christ — and it does so bodily, in the incarnation. This is as strong a statement of Christ’s full deity as the Greek language could possibly express.
7. Titus 2:13 — “Our Great God and Savior, Jesus Christ”
“…waiting for our blessed hope, the appearing of the glory of our great God and Savior Jesus Christ.” (Titus 2:13, ESV)
This verse applies what is known as the Granville Sharp Rule of Greek grammar. In the original Greek, the single definite article governs two nouns connected by “and” (kai) when they refer to the same person. Here, “God and Savior” share one article, meaning they refer to the same person — Jesus Christ. Paul is calling Jesus Christ “our great God and Savior.” The NWT tries to obscure this by inserting “the” before “Savior” — but this is not warranted by the Greek text. The same construction appears in 2 Peter 1:1 with the same result.
8. Hebrews 1:6–8 — The Father Calls the Son “God”
The opening chapter of Hebrews is one of the most powerful Christological passages in Scripture. The author — citing the Old Testament — records the Father speaking to the Son:
“But of the Son he says, ‘Your throne, O God, is forever and ever, the scepter of uprightness is the scepter of your kingdom.'” (Heb. 1:8, ESV)
This is a direct citation of Psalm 45:6, and the author of Hebrews applies it to Jesus, presenting the Father as addressing His Son as “O God” — directly and explicitly. If any passage puts to rest the idea that Jesus is merely a created being, it is Hebrews 1:8. The Father Himself calls the Son God.
Furthermore, Hebrews 1:6 states that all the angels of God worship the Son — and verse 5 asks, “To which of the angels did God ever say, ‘You are my Son’?” The answer is none. The Son is categorically different from — and superior to — all angels, including Michael. He is not an angel. He is God.
“The grace of the Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit be with you all.” (2 Cor. 13:14, ESV)
Paul closes his most difficult letter with a benediction that places the three Persons of the Trinity on equal footing, assigning each a divine attribute: grace (Christ), love (God the Father), fellowship (the Spirit). Significantly, Paul puts Christ before the Father — not because Christ is greater, but because Christ is the point of entry into the relationship. We know the love of the Father and the fellowship of the Spirit because of the grace of the Lord Jesus Christ. This Trinitarian structure is not an afterthought — it is the shape of Paul’s entire theology.
10. Ephesians 4:4–6 — The Trinitarian Unity of the Church
“There is one body and one Spirit — just as you were called to the one hope that belongs to your call — one Lord, one faith, one baptism, one God and Father of all, who is over all and through all and in all.” (Eph. 4:4–6, ESV)
Paul here grounds the unity of the church in the unity of the Triune God. One Spirit, one Lord (Christ), one God and Father — all presented in parallel. The three-times-over “one” echoes the same structure as the threefold “Holy, holy, holy” of Isaiah 6. The church is one because God is one — and God’s oneness is the oneness of Father, Son, and Spirit.
Conclusion
The New Testament is saturated with Trinitarian theology. Not as an afterthought or a late development, but as the central framework through which the Apostles understood everything — the life of Jesus, the mission of the church, the nature of salvation, and the destiny of creation.
We have seen the Father, Son, and Spirit present simultaneously at the baptism of Jesus. We have seen all three share one singular divine Name in the Great Commission. We have seen Christ called God directly by Thomas, by Paul, by the author of Hebrews — and by the Father Himself. We have seen the Holy Spirit placed in equal parallel with the Father and Son in multiple apostolic benedictions.
The Trinity is not read into these texts. It is read out of them.
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