Genesis 21:1-4

MSB(i) 1 Now the LORD attended to Sarah as He had said, and the LORD did for Sarah what He had promised. 2 So Sarah conceived and bore a son to Abraham in his old age, at the very time God had promised. 3 And Abraham gave the name Isaac to the son Sarah bore to him. 4 When his son Isaac was eight days old, Abraham circumcised him, as God had commanded him.