Genesis 21:1-7

Living Bible

21 ^1-2 Then God did as he had promised, and Sarah became pregnant and gave Abraham a baby son in his old age, at the time God had said; ³ and Abraham named him Isaac (meaning “Laughter!”). ^4-5 Eight days after he was born, Abraham circumcised him, as God required. (Abraham was 100 years old at that time.)

⁶ And Sarah declared, “God has brought me laughter! All who hear about this shall rejoice with me. ⁷ For who would have dreamed that I would ever have a baby? Yet I have given Abraham a child in his old age!”