3:156
O you who believe[d]! (Do) not be like those who disbelieved and they said about their brothers when they traveled in the earth or they were fighting, "If they had been with us, not they (would have) died and not they would have been killed." So makes Allah that a regret in their hearts. And Allah gives life and causes death, and Allah of what you do (is) All-Seer.
8:36
Indeed, those who disbelieve, they spend their wealth to hinder (people) from (the) way (of) Allah. So they will spend it, then it will be for them a regret, then they will be overcome. And those who disbelieve, to Hell they will be gathered.