Martyrdom
Muhammad is only a messenger. Many messengers came before him. If he were to die or be killed, would you turn back? Whoever turns away does not harm Allah, but Allah will reward the grateful.
3:144Muhammad is but a messenger, messengers (the like of whom) have passed away before him. Will it be that, when he dieth or is slain, ye will turn back on your heels? He who turneth back on his heels doth no hurt to Allah, and Allah will reward the thankful.