Quran 8:41 — The Spoils of War (Al-Anfal)

You should know that if you gain any spoils in war, one-fifth shall go to GOD and the messenger, to be given to the relatives, the orphans, the poor, and the traveling alien. You will do this if you believe in GOD and in what we revealed to our servant on the day of decision, the day the two armies clashed. GOD is Omnipotent.

[8:40] If they turn away, then you should know that GOD is your Lord and Master; the best Lord and Master, the best supporter.

[8:42] Recall that you were on this side of the valley, while they were on the other side. Then their caravan had to move to lower ground. Had you planned it this way, you could not have done it. But GOD was to carry out a predetermined matter, whereby those destined to be annihilated were annihilated for an obvious reason, and those destined to be saved were saved for an obvious reason. GOD is Hearer, Omniscient.