Leviticus 25:32
Notwithstanding the cities of the Levites, and the houses of the cities of their possession, may the Levites redeem at any time.
Leviticus 27:28
Notwithstanding no devoted thing, that a man shall devote unto the LORD of all that he hath, both of man and beast, and of the field of his possession, shall be sold or redeemed: every devoted thing is most holy unto the LORD.