And Muhammad is no more than a messenger; the messengers have already passed away before him; if then he dies or is killed will you turn back upon your heels? And whoever turns back upon his heels!s, he will by no means do harm to Allah in the least and Allah will reward the grateful.

And certainly We did destroy generations before you when they were unjust, and their messengers had come to them with clear arguments, and they would not believe; thus do We recompense the guilty people.