Deuteronomy 15:12-15

{And} if thy brother, an Hebrew man, or an Hebrew woman, be sold unto thee, and serve thee six years; then in the seventh year thou shalt let him go free from thee.

Exodus 12:44

But every man's servant that is bought for money, when thou hast circumcised him, then shall he eat thereof.

Deuteronomy 15:18

It shall not seem hard unto thee, when thou sendest him away free from thee; for he hath been worth a double hired servant {to thee}, in serving thee six years: and the LORD thy God shall bless thee in all that thou doest.

Deuteronomy 15:1

At the end of {every} seven years thou shalt make a release.

Nehemiah 5:1-5

And there was a great cry of the people and of their wives against their brethren the Jews.

Nehemiah 5:8

And I said unto them, We after our ability have redeemed our brethren the Jews, which were sold unto the heathen; and will ye even sell your brethren? or shall they be sold unto us? Then held they their peace, and found nothing {to answer}.

Deuteronomy 31:10

And Moses commanded them, saying, At the end of {every} seven years, in the solemnity of the year of release, in the feast of tabernacles,

Leviticus 25:39-45

And if thy brother {that dwelleth} by thee be waxen poor, and be sold unto thee; thou shalt not compel him to serve as a bondservant: {compel...: Heb. serve thyself with him with the service, etc}