And Abraham circumcised his son Isaac being eight days old, as God had commanded him.
Abraham fulfills the covenant command with his newborn son.
Genesis 21:4
King James Version (public domain)
Traditionally attributed to Moses · c. 13th century BC · The Pentateuch — Genesis, Exodus, Leviticus, Numbers, and Deuteronomy — is traditionally attributed to him
Context
2For Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him.
3And Abraham called the name of his son that was born unto him, whom Sarah bare to him, Isaac.
4And Abraham circumcised his son Isaac being eight days old, as God had commanded him.
5And Abraham was an hundred years old, when his son Isaac was born unto him.
6And Sarah said, God hath made me to laugh, so that all that hear will laugh with me.