What should those who doubt that Allah will give Muhammad victory do?
Then, when they saw Our doom, they said: We believe in Allah only and reject (all) that we used to associate (with Him). But their faith could not avail them when they saw Our doom. ... The disbelievers will be ruined. 40:84
What should those who doubt that Allah will give Muhammad victory do?
Go hang themselves
Whoso is wont to think (through envy) that Allah will not give him (Muhammad) victory in the world and the
Hereafter (and is enraged at the thought of his victory), let him stretch a rope up to the roof (of his dwelling),
and let him hang himself. 22:15