Leviticus 25:40-41

25:40 He must be with you as a hired worker, as a resident foreigner; he must serve with you until the year of jubilee, 25:41 but then he may go free, he and his children with him, and may return to his family and to the property of his ancestors.

Exodus 21:2-3

Hebrew Servants

21:2 “If you buy a Hebrew servant, he is to serve you for six years, but in the seventh year he will go out free without paying anything. 21:3 If he came in by himself he will go out by himself; if he had a wife when he came in, then his wife will go out with him.

Isaiah 49:9

49:9 You will say to the prisoners, ‘Come out,’

and to those who are in dark dungeons, ‘Emerge.’

They will graze beside the roads;

on all the slopes they will find pasture.

Isaiah 49:25

49:25 Indeed,” says the Lord,

“captives will be taken from a warrior;

spoils will be rescued from a conqueror.

I will oppose your adversary

and I will rescue your children.

Isaiah 52:3

52:3 For this is what the Lord says:

“You were sold for nothing,

and you will not be redeemed for money.”