Quran 3:145 — The Amramites (Ali-'Imran)

No one dies except by GOD's leave, at a predetermined time. Whoever seeks the vanities of this world, we give him therefrom, and whoever seeks the rewards of the Hereafter, we bless him therein. We reward those who are appreciative.

[3:144] Muhammad was no more than a messenger like the messengers before him. Should he die or get killed, would you turn back on your heels? Anyone who turns back on his heels, does not hurt GOD in the least. GOD rewards those who are appreciative.

[3:146] Many a prophet had godly people fight along with him, without ever wavering under pressure in the cause of GOD, nor did they hesitate or become discouraged. GOD loves the steadfast.