Al-Anfaal · verse 41 of 75
8:41
And know that whatever ye take as spoils of war, lo! a fifth thereof is for Allah, and for the messenger and for the kinsman (who hath need) and orphans and the needy and the wayfarer, if ye believe in Allah and that which We revealed unto Our slave on the Day of Discrimination, the day when the two armies met. And Allah is Able to do all things.
8:41 · Al-Anfaal · juz 10 · page 182 · tafsir at quran.com
8:40 · the whole surah · 8:42