Cross reference
Leviticus 25:31
31 But the houses of the villages which have no wall round about them shall be counted as the fields of the country: they may be redeemed, and they shall go out in the jubilee.
Psalms 49:7-8
7 None of them can by any means redeem his brother, nor give to God a ransom for him:
8 (For the redemption of their soul is precious, and it ceaseth for ever:)