Zayd ibn Haritha al-Kalbi

Zayd ibn Ḥāritha al-Kalbī (Arabic: زيد بن حارثة الكلبي) (c. 581–629 CE), was an early Muslim, Sahabi and the former adopted son of the Islamic prophet, Muhammad. He is commonly regarded as the fourth person to have accepted Islam, after Muhammad's wife Khadija, Muhammad's cousin Ali, and Muhammad's close companion Abu Bakr.