But My covenant shall I establish with Isaac, whom Sarah will bear to thee, in these days, in the next year."
And He left off speaking with him, and God went up from Abraham.
And Abraham did according as God had said unto him, and he took Ishmael his son, and all that were born in his house, and whom he had bought with his money, every male in his house, and circumcised the flesh of their foreskin.
And on the selfsame day was Abraham circumcised, and all the men of his house, (and those born in the house), and all those, whom he had bought with money from the children of the stranger, were circumcised with him.