Genesis 17:12 "And every male among you who is eight days old shall be circumcised throughout your generations, a servant who is born in the house or who is bought with money from any foreigner, who is not of your descendants.

Genesis 17:13 "A servant who is born in your house or who is bought with your money shall surely be circumcised; thus shall My covenant be in your flesh for an everlasting covenant.

Leviticus 22:11 But if a priest buys a slave as his property with his money, that one may eat of it, and those who are born in his house may eat of his food. (NASB ©1995)