Genesis 17:13,27
He that is born in your house, and he that is bought with your money, must needs be circumcised: and my covenant shall be in your flesh for an everlasting covenant.
Torrey's Topical Textbook—AKJV

Exodus 12:44
But every man's servant that is bought for money, when you have circumcised him, then shall he eat thereof.
Torrey's Topical Textbook—AKJV