Surah Aal-E-Imran Ayahs #160 Translated in English

O you who have believed, do not be like those who disbelieved and said about their brothers when they traveled through the land or went out to fight, "If they had been with us, they would not have died or have been killed," so Allāh makes that [misconception] a regret within their hearts. And it is Allāh who gives life and causes death, and Allāh is Seeing of what you do.

And if you are killed in the cause of Allāh or die - then forgiveness from Allāh and mercy are better than whatever they accumulate [in this world].

And whether you die or are killed, unto Allāh you will be gathered.

So by mercy from Allāh, [O Muḥammad], you were lenient with them. And if you had been rude [in speech] and harsh in heart, they would have disbanded from about you. So pardon them and ask forgiveness for them and consult them in the matter. And when you have decided, then rely upon Allāh. Indeed, Allāh loves those who rely [upon Him].

If Allāh should aid you, no one can overcome you; but if He should forsake you, who is there that can aid you after Him? And upon Allāh let the believers rely.