The book of Jude was written by Jesus’ half brother Jude some three decades after the start of Christianity. At this stage, we would expects to find some mention of the doctrine of the Trinity, if it is true. But, just like the rest of the scriptures, there is no mention of a Trinity in Jude.

Jude 1—“To those who have been called, who are loved in God the Father and kept for Christ Jesus” (NIV). “God the Father” is obviously a completely separate and distinct person from “Christ Jesus”. If the Trinity doctrine were true, we would expect there to be some mention of it, or the holy Spirit (which is real), at this point, but there isn’t.

Jude 3 – “Fight hard for the faith, which has been once and for all entrusted to God’s holy people” (Jude 3 NJB). What is interesting about this verse is that ‘the Christian faith, or belief, was given to God’s people completely back there in the first century (John 16:13). Trinitarians admit that their “belief as so defined was reached only in the 4th and 5th centuries AD and hence is not explicitly a biblical belief” (Dictionary of the Bible, by John l. McKenzie, S. J.). The Trinity doctrine wasn’t even developed until long after the 1st century, and is demonstrably a “travesty of the truth” (Acts 20:30 NJB).

Jude 4—“There have been some intruders, who long ago were designated for this condemnation, godless persons, who pervert the grace of our God into licentiousness and who deny our only Master and Lord, Jesus Christ” (NAB). Once again, “God” is shown to be someone other than Jesus Christ, and there is no mention of the Trinity or the Holy Spirit (which is real).

Jude 19 – “These are the ones who cause divisions: they live on the natural plane, devoid of the Spirit” (NAB). The language here, “devoid of the Spirit,” is a clue that the Spirit is not a person.

Jude 20,21—“Build yourselves up in your most holy faith; pray in the holy Spirit. Keep yourselves in God’s love as you wait for the mercy of our Lord Jesus Christ that leads to eternal life” (NAB). “The holy Spirit” is mentioned here, but persons are not described by “the”. “Pray in the holy Spirit” implies that it is not a person. This thought usually goes right over Trinitarians’ heads. “God” is again mentioned as someone who is not “our Lord Jesus Christ”.

Jude 25—“to the only God our Savior be glory, majesty, power and authority, through Jesus Christ our Lord” (NIV). This doxology of the letter goes to “the only God our Savior . . . through Jesus Christ our Lord”, which shows that Jesus is “the way” to God (John 14:6), and not God himself. “The only God our Savior” is clearly shown not to be Jesus Christ.

Thus the letter of Jude provides powerful proof that Jesus Christ is not God, and that the holy Spirit is not a person, so there cannot be any Triune God.