Well, to be fair, the word “trinity” is not in the Bible either.
Obviously because it was coined in the English language, not yet written. But Moses, an Egyptian-schooled Jew, under God's direction used the same kind of word describing the Trinity, and the Hebrew word for it was "Jehovah Elohim," as implemented by Jesus just prior to His Ascension. He ordained the Apostles, His heralds of the Gospel, to baptized professing loyal believers "in the Name . . . "--not names--". . . of the Father and of The Son and of The Holy Spirit" as found in Matthew 28:19.
To say otherwise is the height of deliberate ignorance and lack of assiduous study of the Bible.