Quran 8:15 — The Spoils of War (Al-Anfal)

O you who believe, if you encounter the disbelievers who have mobilized against you, do not turn back and flee.

[8:14] This is to punish the disbelievers; they have incurred the retribution of Hell.

[8:16] Anyone who turns back on that day, except to carry out a battle plan, or to join his group, has incurred wrath from GOD, and his abode is Hell; what a miserable destiny!