One-fifth of Booty to the Cause of Allah (Khumus)
57/16. Chapter:
The free emancipation of the captives by the Prophet saws without taking out the Khumus from the booty
Sahih Bukhari
حَدَّثَنَا إِسْحَاقُ بْنُ مَنْصُورٍ، أَخْبَرَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، عَنْ مُحَمَّدِ بْنِ جُبَيْرٍ، عَنْ أَبِيهِ ـ رضى الله عنه ـ أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ فِي أُسَارَى بَدْرٍ " لَوْ كَانَ الْمُطْعِمُ بْنُ عَدِيٍّ حَيًّا، ثُمَّ كَلَّمَنِي فِي هَؤُلاَءِ النَّتْنَى، لَتَرَكْتُهُمْ لَهُ ".
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."
Reference : Sahih al-Bukhari 3139In-book reference : Book 57, Hadith 47USC-MSA web (English) reference : Vol. 4, Book 53, Hadith 367