Genesis 17:27

An all the men of his house, born in the house, and bought with money of the stranger, were circumcised with him.

Genesis 17:26

In the selfsame day was Abraham circumcised, and Ishmael his son.

Genesis 17:25

And Ishmael his son [was] thirteen years old, when he was circumcised in the flesh of his foreskin.

Genesis 17:24

And Abraham [was] ninety years old and nine, when he was circumcised in the flesh of his foreskin.

Note:  When Abraham was 99, it was 1948 years since the creation of Adam (by the way, 1948 was when the declaration (i.e., announcement) that State of Israel was born was made  by David Ben Gurion was announced), and Shem, the son of Noah, was still alive.

Genesis 17:23

And Abraham took Ishmael his son, and all that were born in his house, and all that were bought with his money, every male among the men of Abraham's house; and circumcised the flesh of their foreskin in the selfsame day, as God had said unto him.

Genesis 17:13

He that is born in thy house, and he that is bought with thy money, must needs be circumcised: and my covenant shall be in your flesh for an everlasting covenant.

Genesis 17:12

And he that is eight days old shall be circumcised among you, every man [male] child in your generations, he that is born in the house, or bought with money of any stranger, which [is] not of thy seed.

Genesis 17:11

And ye shall circumcise the flesh of your foreskin; and it shall be a token [sign] of the covenant betwixt me and you.

Genesis 17:10

This [is] my covenant, which ye shall keep, between me and you and thy seed after thee; Every man child among you shall be circumcised.