Leviticus 25:48

45 Moreover of the children of the strangers that sojourn among you, of them shall ye buy, and of their families that are with you, which they begat in your land: and they shall be your possession.

46 And ye shall take them as an inheritance for your children after you, to inherit [them for] a possession, they shall be your bond-men for ever: but over your brethren the children of Israel, ye shall not rule one over another with rigor.

47 And if a sojourner or a stranger shall become rich by thee, and thy brother [that dwelleth] by him shall become poor, and sell himself to the stranger [or] sojourner by thee, or to the stock of the stranger's family:

48 After that he is sold he may be redeemed again; one of his brethren may redeem him:

49 Either his uncle, or his uncle's son may redeem him, or [any] that is nigh of kin to him of his family, may redeem him; or if he is able, he may redeem himself.

50 And he shall reckon with him that bought him, from the year that he was sold to him, to the year of jubilee: and the price of his sale shall be according to the number of years, according to the time of a hired servant shall it be with him.

51 If [there shall be] yet many years [behind], according to them he shall give again the price of his redemption out of the money that he was bought for.