Leviticus 25:39 (KJV)

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.

Thou shalt not give him thy money upon usury, nor lend him thy victuals for increase.

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.

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.

Thou shalt not rule over him with rigour; but shalt fear thy God.

Both thy bondmen, and thy bondmaids, which thou shalt have, shall be of the heathen that are round about you; of them shall ye buy bondmen and bondmaids.