A Trinity is mentioned in the Quran in these verses:

[4:171] O people of the scripture, do not transgress the limits of your religion, and do not say about God except the truth. The Messiah, Jesus, the son of Mary, was a messenger of God, and His word that He had sent to Mary, and a revelation from Him. Therefore, you shall believe in God and His messengers. You shall not say, “Trinity.” You shall refrain from this for your own good. God is only one god. Be He glorified; He is much too glorious to have a son. To Him belongs everything in the heavens and everything on earth. God suffices as Lord and Master.

[5:73] Pagans indeed are those who say that God is a third of a trinity. There is no god except the one god. Unless they refrain from saying this, those who disbelieve among them will incur a painful retribution.

To learn more, read the Quran in English.

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