Sabbatic Year: Israelite Bondservants Set Free In
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Exodus 21:2
If you buy a Hebrew servant, he is to serve you for six years. But in the seventh year, he shall go free without paying anything.
Deuteronomy 15:12
If a fellow Hebrew, a man or a woman, is sold to you and serves you six years, then in the seventh year you must set him free.
Jeremiah 34:14
Every seventh year, each of you must free his Hebrew brother who has sold himself to you. He may serve you six years, but then you must let him go free. But your fathers did not listen or incline their ear.