An excerpted section from Menorah Ministries:
“The Trinity is a Hebrew Concept”
The trinity is one of the greatest truths we have to share, because by it we alone, of all faiths, can declare the truth that God IS love! In order to love, we need an object of affection, but since God is Father, Son and Spirit, he was already living in loving unity long before he created the world! In himself, God’s very essence is love with no need of outside intervention. We could say that a singular God could be loving in nature, but to say that he IS love is a unique privilege of those who believe that he can give and receive love in and of himself.
They're all there, the entire time, all through the Tenach
The word “trinity” cannot be found in the Bible, but the truth is that the three of them have been there together all the way along. Genesis tells us that God created the heavens and the earth by his word. John 1 tells us that the Word is Yeshua - that he was with God and was God from the get go, right there at creation. We also see the third person of the trinity, the Holy Spirit, hovering over the waters in the second verse of the Bible. Not sure about this? The first words of the Bible in Hebrew are: בראשית ברא אלוהים
In the beginning, God created (or “in the beginning, created God...”, because that’s the way Hebrew sentences are structured). The word for God is Elohim. This word Elohim, very interestingly, is plural. Still not convinced? The decision to create humanity is made. “Let us make man in our image, after our likeness”, says the plural God, in plural. There is no getting away from it this time. The Hebrew is very clear.
John 5:39-You pore over the Scriptures because you think you have eternal life in them, and yet they testify about me (Jesus).