Leviticus 25:44

New Century Version

“ ‘Your men and women slaves must come from other nations around you; from them you may buy slaves.

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If someone buys a slave and circumcises him, the slave may eat the Passover.

But if the slave gets well after a day or two, the owner will not be punished since the slave belongs to him.

You must not rule this person cruelly, but you must respect your God.

Also you may buy as slaves children from the families of foreigners living in your land. These child slaves will belong to you,