"Muhammad (peace be upon him) treated his slaves with unmatched kindness and even married some to free them, showing Allah's mercy. The Qur'an urges, ‘Righteousness is… to free the slave' (Surah Al-Balad, 90:13), and he lived it—he freed Zayd ibn Haritha, made him family (Sahih Bukhari), and married Safiyyah (may Allah be pleased with her) after freeing her (Sunan Ibn Majah). He said, ‘Your slaves are your brothers' (Sahih Bukhari), sharing food and clothes with them.
Jesus (peace be upon him) taught compassion—‘We gave him the Injeel, in which was guidance and light' (Surah Al-Ma'idah, 5:46)—and the Qur'an says, ‘The Messiah, son of Mary, was no more than a messenger' (Surah Al-Ma'idah, 5:75). The Prophet's care—‘We have not sent you except as a mercy to the worlds' (Surah Al-Anbiya, 21:107)—echoed Jesus' way, lifting slaves to honor so they could worship Allah alone."