Genesis 21:2-4

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2} Sarah became pregnant and bore a son to Abraham in his old age, at the appointed time God had told him.^(A) ^{Tools
3} Abraham named his son who was born to him—the one Sarah bore to him—Isaac.^(B) ^{Tools
4} When his son Isaac was eight days old, Abraham circumcised him, as God had commanded him.^(C)

Cross references:

A. Genesis 21:2: Genesis 17:21; Genesis 18:10; Genesis 18:14; Hebrews 11:11

B. Genesis 21:3: Genesis 17:19

C. Genesis 21:4: Genesis 17:10; Genesis 17:12; Acts 7:8