God had promised Abraham that the world would be blessed through his descendants. When Isaac was born to Abraham and Sarah, it was the initial fulfillment of that promise. At God’s command, Isaac was almost sacrificed by his father, but his life was spared when God provided a ram to be sacrificed in his place. This prefigured the sacrifice of God’s own Son in the place of all who would believe in him. Isaac settled in Gerar, a Philistine city, where he became prosperous. He married Rebekah, who bore him twin sons, Jacob and Esau. Although Esau was his favorite son, Isaac was tricked by Jacob into giving him the blessing intended for his older brother. (Genesis 21:1–3)