2 So Sarah became pregnant and gave birth to a son for Abraham in his old age, at the appointed time that God had told him.
3 Abraham named his son who was born to him—whom Sarah bore for him—Isaac.
4 Then Abraham circumcised Isaac, his eight-day-old son, just as God had commanded him.
5 Abraham was 100 years old when Isaac his son was born to him.
6 So Sarah said, “God has made laughter for me! Everyone who hears will laugh with me.”
7 She also said, “Who would have said to Abraham, ‘Sarah has nursed children’? For I have given birth to a son in his old age!”
8 The child grew and was weaned—Abraham made a big feast on the day Isaac was weaned.