Sahih Bukhari Volume 3, Book 46, Hadith Number 693.

Narated By Abu Huraira : The Prophet said, “Whoever frees a Muslim slave, Allah will save all the parts of his body from the (Hell) Fire as he has freed the body-parts of the slave.” Said bin Marjana said that he narrated that Hadith to ‘Ali bin Al-Husain and he freed his slave for whom ‘Abdullah bin Ja’far had offered him ten thousand Dirhams or one-thousand Dinars.