Zayd ibn Haritha

Zayd ibn Haritha al-Kalbi was the adopted son of Prophet Muhammad ﷺ before adoption was redefined in Islam. Born in the tribe of Kalb, he was captured as a child and enslaved, eventually coming to be owned by Khadijah bint Khuwaylid, who gave him to the Prophet as a gift. When his biological family came to ransom him, the young Zayd chose to remain with the Prophet — a remarkable act of devotion. The Prophet freed him and called him 'Zayd ibn Muhammad' until Surah al-Ahzab (33:37) revealed that adopted sons must retain their biological fathers' names. He was among the first converts to Islam. The Prophet married him to his cousin Zaynab bint Jahsh, but the marriage was troubled. After their divorce, the Prophet married Zaynab — an event directly addressed in the Quran (33:37) to dissolve the cultural taboo against marrying the ex-wife of an adopted son. Zayd was appointed commander of the army sent to Mu'tah in 8 AH, the first major clash with Byzantine forces. He was martyred in the battle, followed by Ja'far ibn Abi Talib and then Abdullah ibn Rawahah as commanders in succession. The Prophet wept upon receiving news of his death — the only Companion whose death caused the Prophet to openly weep in front of the Ansar. His son Usama ibn Zayd was also a beloved Companion and commander.