Quran 3:100 — The Amramites (Ali-'Imran)

O you who believe, if you obey some of those who received the scripture, they will revert you, after having believed, into disbelievers.

[3:99] Say, "O followers of the scripture, why do you repel from the path of GOD those who wish to believe, and seek to distort it, even though you are witnesses?" GOD is never unaware of anything you do.

[3:101] How can you disbelieve, when these revelations of GOD have been recited to you, and His messenger has come to you? Whoever holds fast to GOD will be guided in the right path.