Leviticus 25:37 (KJV)

Notwithstanding the cities of the Levites, and the houses of the cities of their possession, may the Levites redeem at any time.

And if a man purchase of the Levites, then the house that was sold, and the city of his possession, shall go out in the year of jubile: for the houses of the cities of the Levites are their possession among the children of Israel.

But the field of the suburbs of their cities may not be sold; for it is their perpetual possession.

And if thy brother be waxen poor, and fallen in decay with thee; then thou shalt relieve him: yea, though he be a stranger, or a sojourner; that he may live with thee.

Take thou no usury of him, or increase: but fear thy God; that thy brother may live with thee.

I am the LORD your God, which brought you forth out of the land of Egypt, to give you the land of Canaan, and to be your God.

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:

But as an hired servant, and as a sojourner, he shall be with thee, and shall serve thee unto the year of jubile.

And then shall he depart from thee, both he and his children with him, and shall return unto his own family, and unto the possession of his fathers shall he return.

For they are my servants, which I brought forth out of the land of Egypt: they shall not be sold as bondmen.