Sahih al-Bukhari · Hadith 3112

One-fifth of Booty to the Cause of Allah (Khumus)

Muhammad bin Suqa:I heard Mundhir at-Tawri reporting Ibn Hanafiya who said, "My father sent me saying, 'Take this letter to `Uthman for it contains the orders of the Prophet (ﷺ) concerning the Sadaqa