Words from Quran (14)

Muhammad is no more than a Messenger, and indeed (many) Messengers have passed away before him. If he dies or is killed, will you then turn back on your heels (as disbelievers)? And he who turns back on his heels, not the least harm will he do to Allah, and Allah will give reward to those who are grateful.

- Surah Aal-'Imran (Verses 144)