Genesis 21:3-5

New King James Version

³ And Abraham called the name of his son who was born to him—whom Sarah bore to him—^(A)Isaac.^{[a] 4} Then Abraham ^(B)circumcised his son Isaac when he was eight days old, ^(C)as God had commanded him. ⁵ Now ^(D)Abraham was one hundred years old when his son Isaac was born to him.