Muṣʿab ibn ʿUmayr (Arabic: مصعب بن عمير) also known as Muṣʿab al-Khayr ("the Good") was a sahabi (companion) of Muhammad PBUH. From the Banū ʿAbd al-Dār branch of the Quraysh, he embraced Islam in 614 CE and was the first ambassador of Islam. He died in the Battle of Uhud in 625 CE.