Al-Kāfi - Volume 7 > The Guardianship of One who Sets One Free
Hadith #2

2- مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ ابْنِ فَضَّالٍ عَنِ ابْنِ بُكَيْرٍ عَنْ زُرَارَةَ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ السَّلام) فِي حَدِيثِ بَرِيرَةَ أَنَّ النَّبِيَّ (صَلَّى اللهُ عَلَيْهِ وَآلِه) قَالَ لِعَائِشَةَ أَعْتِقِي فَإِنَّ الْوَلاءَ لِمَنْ أَعْتَقَ.

2. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from ibn Faddal from ibn Bukayr from Zurarah who has narrated the following: “Abu Ja‘far, ‘Alayhi al-Salam, about Hadith of Burayrah has said, ‘The Holy Prophet, O Allah, grant compensation to Muhammad and his family worthy of their services to Your cause, said to ‘A’ishah, ‘Set a slave free because guardianship rests with the one who buys one’s freedom.’”