Abu Huraira reported God's Messenger as saying, "If anyone emancipates a Muslim slave, God will set free from hell a member of the body for every member of his, even his private parts for his."
(Bukhari and Muslim.)
Abu Dharr said he asked the Prophet (ﷺ) what action was most excellent, and he replied, "Faith in God and jihad in His path." He then asked which slaves were most excellent 1 and he replied. “Those whose price is highest…