IRTIDĀD (ارتداد). [[APOSTASY].]
ʿĪSĀ (عيسى). The name given to Jesus in the Qurʾān and all Muḥammadan writings. [[JESUS CHRIST].]
ISAAC. Arabic Isḥāq (اسحاق). The son of Abraham. He is mentioned in the Qurʾān as specially the child of promise, and a gift from God to Abraham; and also as an inspired prophet.
[Sūrah xxi. 72]: “And We (God) gave him (Abraham) Isaac and Jacob as a farther gift; and we made them all righteous.”
“And when he had separated himself from them and that which they worshipped beside God, we bestowed on him Isaac and Jacob; and each of them we made a prophet.
“And we bestowed gifts on them in our mercy, and gave them the lofty tongue of truth.”
The birth of Isaac as a child of promise to Abraham is related in [Sūrah xi. 72–77]:—
“And our messengers came formerly to Abraham with glad tidings. ‘Peace,’ said they. He said, ‘Peace,’ and he tarried not, but brought a roasted calf.
“And when he saw that their hands touched it not, he misliked them, and grew fearful of them. They said, ‘Fear not, for we are sent to the people of Lot.’