The Prophet ﷺ said, "Whoever frees a Muslim man, Allah will rescue from the Fire a limb of his for every limb of the freed man."Saeed bin Marjana said, "I went with this hadith to Ali bin Husayn, and Ali bin Husayn turned to a slave of his for whom Abdullah bin Jafar had offered him ten thousand dirhams or one thousand dinars, and he freed him."
قال النبي ﷺ: أيما رجل أعتق امرأ مسلما، استنقذ الله بكل عضو منه عضوا منه من النار. قال سعيد بن مرجانة: فانطلقت به إلى علي بن حسين، فعمد علي بن حسين إلى عبد له قد أعطاه به عبد الله بن جعفر عشرة آلاف درهم أو ألف دينار، فأعتقه.
Bukhari narrated it in "Manumission" (2517), and Muslim narrated it in "Manumission" (1509:24), both through Aasim bin Muhammad Umari, who said, "Waqid bin Muhammad (meaning his brother) told me, Saeed bin Marjana, the companion of Ali bin Husayn, told me, he said, Abu Hurairah said to me," then he mentioned it.