Quran 5:73 — The Feast (Al-Ma'edah)

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.

[5:72] Pagans indeed are those who say that GOD is the Messiah, son of Mary. The Messiah himself said, "O Children of Israel, you shall worship GOD; my Lord and your Lord." Anyone who sets up any idol beside GOD, GOD has forbidden Paradise for him, and his destiny is Hell. The wicked have no helpers.

[5:74] Would they not repent to GOD, and ask His forgiveness? GOD is Forgiver, Most Merciful.