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Deuteronomy 15:12

New International Version 1984 (NIV1984)

Freeing Servants
 12 If a fellow Hebrew, a man or a woman, sells himself to you and serves you six years, in the seventh year you must let him go free.

From BibleGateway.com: http://www.biblegateway.com/passage/?search=Deuteronomy 15:12&version=NIV1984