43:10 “You are my witnesses,” says the LORD, “With my servant whom I have chosen; that you may know and believe me, and understand that I am he. Before me there was no God formed, neither will there be after me.
The Bible starts with a God who is one and yet a plurality of persons, showing that the doctrine of the Trinity is not a later addition.
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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.
Q25: Do Jews, Christians and Muslims all believe that there is only “one” true God? (Monotheism or Vahdet-i Vujûd)
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How the Old Testament uses the name of God and how this matches with how Jesus uses it about Himself.