Genesis

²And Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him. ³And Abraham called the name of his son that was born unto him, whom Sarah bare to him, Isaac. ⁴And Abraham circumcised his son Isaac when he was eight days old, as God had commanded him. ⁵And Abraham was an hundred years old, when his son Isaac was born unto him. ⁶And Sarah said, God hath made me to laugh; every one that heareth will laugh with me. ⁷And she said, Who would have said unto Abraham, that Sarah should give children suck? for I have borne him a son in his old age. ⁸And the child grew, and was weaned: and Abraham made a great feast on the day that Isaac was weaned.