Sahih al-Bukhari · Hadith 3139

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

Narrated Jubair bin Mut`im: The Prophet (ﷺ) talked about war prisoners of Badr saying, "Had Al-Mut`im bin Adi been alive and interceded with me for these mean people, I would have freed them for his sake