Isaac (Arabic: إسحاق‎‎ or إسحٰق‎ Isḥāq) is recognized as a patriarch, prophet and messenger of God by all Muslims. In Islam, he is known as Isḥāq. As in Judaism and Christianity, Islam maintains that Isaac was the son of the patriarch and prophet Abraham from his wife Sarah. Muslims hold Isaac in deep veneration because they believe that both Isaac and his older half-brother Ishmael continued their father's spiritual legacy through their subsequent preaching of the message of God after the death of Abraham. Isaac is mentioned in fifteen passages of the Qur'an.