Genesis 17:11 DBY

⁹  And God said to Abraham, And [as for] thee, thou shalt keep my covenant, thou and thy seed after thee in their generations.

¹⁰  This is my covenant which ye shall keep, between me and you and thy seed after thee -- that every male among you be circumcised.

¹¹  And ye shall circumcise the flesh of your foreskin; and [that] shall be a sign of the covenant between me and you.

¹²  And at eight days old shall every male in your generations be circumcised among you -- he who is born in the house, and he who is bought with money, any stranger who is not of thy seed.

¹³  He who is born in thy house, and he who is bought with thy money, must be circumcised; and my covenant shall be in your flesh for an everlasting covenant.