Genesis 21:4
And Abraham circumcised his son Isaac being eight days old, as God had commanded him.
And Abraham circumcised his son Isaac, being eight days old as,
God had commanded him. Genesis 17:12, and was the first that we read of that was circumcised on that day, according to the divine precept, which Abraham strictly observed; for though this was the son of the promise, and of his old age, for whom he had the most affectionate regard, yet he administered this bloody ordinance on him; nor did he defer it beyond the time, and was himself the operator, as it seems; all which shows his strict regard, and ready and cheerful obedience to the command of God.