3:52When Jesus sensed disbelief on their part, he said, “Who are my allies towards God?” The disciples said, “We are God’s allies; we have believed in God, and bear witness that we submit.”

3:90As for those who disbelieve after having believed, then plunge deeper into disbelief, their repentance will not be accepted; these are the lost.

3:100O you who believe! If you obey a party of those who were given the Scripture, they will turn you, after your belief, into disbelievers.

3:106On the Day when some faces will be whitened, and some faces will be blackened. As for those whose faces are blackened: “Did you disbelieve after your belief?” Then taste the punishment for having disbelieved.

3:176And do not be saddened by those who rush into disbelief. They will not harm God in the least. God desires to give them no share in the Hereafter. A terrible torment awaits them.