Genesis 21:2-12

2 So she became pregnant, and at the exact time God had promised, she gave birth to a son for Abraham in his old age.
3 Abraham named his newborn son Isaac.
4 When Isaac was eight days old, Abraham circumcised him as God had commanded.
5 Abraham was 100 years old when his son Isaac was born.
6 Sarah said, "God has brought me laughter, and everyone who hears about this will laugh with me.
7 Who would have predicted to Abraham that Sarah would nurse children? Yet, I have given him a son in his old age."
8 The child grew and was weaned. On the day Isaac was weaned, Abraham held a big feast.
9 Sarah saw that Abraham's son by Hagar the Egyptian was laughing at Isaac.
10 She said to Abraham, "Get rid of this slave and her son, because this slave's son must never share the inheritance with my son Isaac."
11 Abraham was upset by this because of his son Ishmael.
12 But God said to Abraham, "Don't be upset about the boy and your slave. Listen to what Sarah says because through Isaac your descendants will carry on your name.
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