The Bible doesn’t use the word Trinity which Tertulliian coined, but the Trinity does exist in the Bible: Matthew 28:19 Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, John 10:30 I and the Father are one.” John 1:1 In the beginning was the Word, and the Word was with God, and the Word was God. 1 John 5:7 For there are three that testify: John 14:26 But the Helper, the Holy Spirit, whom the Father will send in my name, he will teach you all things and bring to your remembrance all that I have said to you. John 15:26 “But when the Helper comes, whom I will send to you from the Father, the Spirit of truth, who proceeds from the Father, he will bear witness about me. John 1:14 And the Word became flesh and dwelt among us, and we have seen his glory, glory as of the only Son from the Father, full of grace and truth....