Ubaydah ibn al-Harith (Arabic: عبيدة بن الحارث) is the son of Harith ibn Abd al-Muttalib and one of the sahaba of Muhammad
Obaidah ibn al-Harith ibn Abdul-Muttalib, was the first Muslim to be killed in battle. He was a cousin of Muhammad and Ali, and he was the first Martyr of the battle of Badr. Following his death, his widow Zaynab bint Khuzayma became Muhammad's fifth wife.
Zayd ibn Haritha was the first Muslim to be killed on foreign soil.