Abu Hurairah (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said, "He who sets free a Muslim slave, Allah will deliver from the fire of Hell every limb of his body in return for every limb of the slave's body, even his private parts."[Al-Bukhari and Muslim].
App reference: Book 12, Hadith 74
Arabic/English book reference: Book 12, Hadith 1358