From now and for all generations to come every male among you who is eight days old must be circumcised. This includes not only your sons but also those born in your household or bought from foreigners.
After eight days, the time came for the baby to be circumcised, and he was named Jesus. This was the name given to him by the angel before he had even been conceived.
God also gave Abraham the agreement regarding circumcision, and so when Isaac was born, Abraham circumcised him on the eighth day. Isaac was the father of Jacob, and Jacob the father of the twelve patriarchs.