14:26 But the Counsellor, the Holy Spirit, whom the Father will send in my name, will teach you all things, and will remind you of all that I said to you.
The trinity is the foundational teaching of the Bible that God is one God, who has eternally existing in three persons, Father, Son and Sprit who each are fully God. This idea is denied by the Quran, which states that God is an indivisible unity, who can have no partners. The Trinity, while mysterious, is simple to define and a beautiful truth we can confidently hold to and reference in reaching out to others.
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Is Muhammad Foretold in the Bible?, John Gilchrist
Jesus: an overview, CCI