Isaac (/ˈaɪzək/; Hebrew: יִצְחָק, Modern Yitskhak, Tiberian Yiṣḥāq, ISO 259-3 Yiçḥaq, "[he] will laugh"; Ancient Greek: ἸσαάκIsaak Arabic: إسحاق or إسحٰقʼIsḥāq) as described in the Hebrew Bible and the Qur'an, was the second son of Abraham, the only son Abraham had with his wife Sarah, and the father of Jacob and Esau. According to the Book of Genesis, Abraham was 100 years old when Isaac was born, and Sarah was past 90.
According to the Genesis narrative, Abraham brought Isaac to Mount Moriah, where, at God's command, Abraham built a sacrificial altar to sacrifice Isaac. This event served as a test of Abraham's faith. At the last moment an angel stopped him.
Isaac was one of the three patriarchs of the Israelites. Isaac was the only biblical patriarch whose name was not changed, and the only one who did not move out of Canaan. Compared to those of Abraham and Jacob, Isaac's story relates fewer incidents of his life. He died when he was 180 years old, making him the longest-lived of the three.