Isaac was named before he was born. When Abraham was ninety-nine, God said that Sarah would bear a son the following year and that his name would be Isaac. Abraham laughed as he considered that he was one hundred and Sarah was ninety. Sarah also laughed to herself when she heard the promise near the tents at Mamre. Isaac’s name stands in connection with both responses. The account does not describe his development before birth or tell us how his parents prepared for him.
Sarah gave birth at the promised time, and Abraham named the child Isaac as God had instructed. Isaac was circumcised when he was eight days old. Abraham held a great feast when the child was weaned. Around that time Sarah saw Ishmael, Hagar’s son, and demanded that Hagar and the boy be sent away. Abraham was distressed, but after God told him to listen to Sarah, he gave Hagar bread and water and sent them away. The account does not say how young Isaac experienced this division. A decision made around his inheritance removed his half brother and Hagar from the household.
The longest scene from Isaac’s early years begins when Abraham took him toward the land of Moriah. God tested Abraham by telling him to offer Isaac as a burnt offering. Abraham rose early and traveled with Isaac and two servants. On the third day, he left the servants behind, placed the wood on Isaac, and carried the fire and knife himself. Isaac asked where the lamb for the offering was. Abraham answered that God would provide it, and the two continued together. Isaac’s exact age at this point is not given.
At the mountain Abraham built an altar, arranged the wood, bound Isaac, and placed him on it. He raised the knife to kill his son, but God’s messenger stopped him. Abraham saw a ram caught by its horns in a thicket and offered it instead of Isaac. Scripture does not record what Isaac said while he was bound or how father and son later spoke about what happened. In the scene, Isaac is both the promised son and the son who is physically bound and brought close to death while his father’s obedience is tested.
After Sarah died, Abraham sent the senior servant of his household to his relatives to find a wife for Isaac. Abraham insisted that Isaac must not be taken back to that land and that a woman who did not wish to come must not be forced. At a well, the servant met Rebekah, who drew water for him and his camels. He explained his mission to her family. When they asked Rebekah directly whether she would go, she said that she would. Isaac did not participate in that process. His story met hers only after the servant and Rebekah completed the journey.
When Rebekah reached Canaan, Isaac was living in the Negev and had gone out into the field toward evening. The returning servant told him everything that had happened. Isaac brought Rebekah into the tent that had belonged to Sarah, took her as his wife, and loved her. Genesis says that he was comforted after his mother’s death. Isaac was forty when he married. His household began through the limits set by Abraham, the servant’s journey, Rebekah’s decision to leave, and the life Isaac and Rebekah then made together.
Abraham gave all he owned to Isaac, while giving gifts to his other sons and sending them east, away from Isaac. When Abraham died at one hundred seventy-five, Isaac and Ishmael buried their father in the cave of Machpelah. The two sons who had been separated in childhood are named together at their father’s burial. After Abraham’s death, God blessed Isaac, who lived near Beer Lahai Roi. He had inherited more than his father’s property. The promise made to Abraham would now continue through the responsibilities of Isaac’s household.
For many years Rebekah had no child. Isaac prayed for his wife, and she conceived twins. When the children struggled within her, Rebekah asked God what was happening and heard that two peoples would separate from her and that the older would serve the younger. Esau and Jacob were born when Isaac was sixty. Esau came first, red and covered with hair, and Jacob followed holding his brother’s heel. The twin sons born after twenty years of marriage entered the family already marked by struggle.
Esau grew into a hunter, while Jacob stayed among the tents. The parents’ affections divided as well. Isaac loved Esau because he enjoyed the game Esau brought home, while Rebekah loved Jacob. One day Esau returned exhausted and asked Jacob for stew. Jacob demanded the birthright in return, and Esau swore it away. Isaac did not take part in that exchange, but the parents’ favoritism and the brothers’ competition would later meet in the deception surrounding his blessing.
Another famine brought Isaac to Gerar. God told him not to go down to Egypt but to remain in the land, and directly confirmed the promise of land and descendants first given to Abraham. Isaac nevertheless feared that local men would kill him because of Rebekah, so he called his wife his sister. King Abimelech observed the couple together, discovered the truth, and rebuked Isaac. He then ordered that no one harm either of them. The fearful act Abraham had used in Egypt and Gerar appeared again in his son’s life, and Rebekah shared the danger it created.
Isaac planted crops and harvested one hundred times what he had sown that year. His flocks, herds, and household grew until the Philistines envied him. They filled the wells dug in Abraham’s time, and Abimelech asked Isaac to leave because he had become too powerful. Isaac moved into the valley of Gerar, reopened his father’s wells, and restored their names. When herders claimed each new source of water, he named two wells Esek and Sitnah and moved on. No one disputed the third, and Isaac called it Rehoboth because room had been made for them to flourish in the land.
At Beersheba, God appeared to Isaac, promised to remain with him, and told him not to fear. Isaac built an altar, called on God’s name, pitched his tent, and had his servants dig again. Abimelech, who had sent him away, came to make an agreement after recognizing that God was with Isaac. Isaac prepared a feast, and the men ate, drank, and swore peace the next morning. On that same day, his servants reported that they had found water in another well. Isaac’s work through displacement and conflict was to reopen wells, keep moving, and finally make peace with the people who had expelled him.
When Esau was forty, he married two Hittite women. These marriages brought grief to Isaac and Rebekah. The marriages of the sons were not separate from the household conflict. When Isaac was old, Rebekah spoke of her distress over the Hittite women and asked what life would mean if Jacob also married a woman from the land. Her words served both her plan to move Jacob away from Esau and the direct background for Isaac’s decision about where his younger son should seek a wife.
When Isaac grew old and his eyesight failed, he called Esau and asked for a meal from hunted game before giving him a blessing. Rebekah overheard and devised a plan for Jacob to appear as his brother. Jacob wore Esau’s clothes and covered his hands and neck with goatskin, repeatedly claiming that he was Esau. Isaac recognized Jacob’s voice and questioned him, but after touching his hands and smelling his clothes, he blessed him with grain, wine, and rule over his brothers. Isaac’s preference for Esau and confidence in his plan became entangled with his failing sight, Rebekah’s scheme, and Jacob’s lies.
When Esau returned, Isaac realized that he had been deceived and shook violently. Esau wept and asked for a blessing of his own, but Isaac said that the blessing given to Jacob would stand. He told Esau that he would live by the sword, serve his brother, and one day throw off the yoke. When Esau planned to kill Jacob, Rebekah prepared to send Jacob to her family. This time Isaac knowingly blessed Jacob again and sent him to Paddan Aram to find a wife rather than marry a Canaanite woman. Esau saw that Canaanite women did not please his father and, in addition to his existing wives, married a daughter of Ishmael. After the stolen blessing, Isaac directly asked that the blessing given to Abraham continue through Jacob.
Many years later Jacob returned to Canaan with his household and came to Isaac at Mamre near Hebron. Genesis does not tell us what father and son said at their reunion or describe Rebekah’s final years. Isaac died at one hundred eighty, and Esau and Jacob buried him together. Later, when Jacob requested burial with his ancestors, he named the cave of Machpelah as the place where Isaac and Rebekah had been buried. Isaac, who had once walked toward Moriah with his father, was finally buried by the two sons whose conflict had divided his household and was laid beside his wife in the family tomb.