Sahih Muslim | Book 15 | Hadith Number 4104
Narrated by 'Abdullah b. 'Umar
'Abdullah b. 'Umar reported Allah's Messenger (may peace be upon him) as saying: He who gives up his share in a slave, and he has money enough to meet the full price, a fair price for him should be fixed; otherwise be has emancipated him to the extent that he has emancipated.