Here is an outline of where the Bible Teaches the Trinity.
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Have you ever wondered why the answer is so long, an outline, reference to another site? It's because the trinity is not in the Bible, not the word and not the concept. To avoid the inevitable Appeal to Strawman, there simply is no verse that reads something like
The nature of God is a trinity - consisting of the Father, Son & Holy Spirit who are co-equal, co-substantial and co-eternal - and if you do not believe this, you cannot be saved but are damned to hell forever. If there were such a verse, it would be the most quoted verse in Scripture by those who claim one’s salvation depends on believing it. The concept of the trinity is so important that in 66 books, it is not mentioned once!
Rather than abandon this obvious
1st-Commandment-violating idol, trinitarians resort to ignoring or subordinating
explicit teachings in Scripture to inferences (reading their doctrine into the non-trinitarian text), dualism and
mystical artificial synthesis. Using such tactics, any doctrine can be 'supported' in linking so many verses.