Matthew 18:25
But for as much as he had not to pay, his lord commanded him to be sold, and his wife, and children, and all that he had, and payment to be made.
Torrey's Topical Textbook—AKJV

Exodus 21:2
If you buy an Hebrew servant, six years he shall serve: and in the seventh he shall go out free for nothing.
Torrey's Topical Textbook—AKJV