Exodus 23:12

23:12 For six days you are to do your work, but on the seventh day you must cease, in order that your ox and your donkey may rest and that your female servant’s son and any hired help may refresh themselves.

Leviticus 25:44-46

25:44 “‘As for your male and female slaves who may belong to you – you may buy male and female slaves from the nations all around you. 25:45 Also you may buy slaves from the children of the foreigners who reside with you, and from their families that are with you, whom they have fathered in your land, they may become your property. 25:46 You may give them as inheritance to your children after you to possess as property. You may enslave them perpetually. However, as for your brothers the Israelites, no man may rule over his brother harshly.

Nehemiah 5:5

5:5 And now, though we share the same flesh and blood as our fellow countrymen, and our children are just like their children, still we have found it necessary to subject our sons and daughters to slavery. Some of our daughters have been subjected to slavery, while we are powerless to help, since our fields and vineyards now belong to other people.”