16 “If a man dedicates to the Lord part of the land that is his possession, then the valuation shall be in proportion to its seed. A homer  of barley seed shall be valued at fifty shekels of silver. 17 If he dedicates his field from the year of jubilee, the valuation shall stand, 18 but if he dedicates his field after the jubilee, then the priest shall calculate the price according to the years that remain until the year of jubilee, and a deduction shall be made from the valuation. 19 And if he who dedicates the field wishes to redeem it, then he shall add a fifth to its valuation price, and it shall remain his. 20 But if he does not wish to redeem the field, or if he has sold the field to another man, it shall not be redeemed anymore. 21 But the field, when it is released in the jubilee, shall be a holy gift to the Lord, like a field that has been devoted. The priest shall be in possession of it. 22 If he dedicates to the Lord a field that he has bought, which is not a part of his possession, 23 then the priest shall calculate the amount of the valuation for it up to the year of jubilee, and the man shall give the valuation on that day as a holy gift to the Lord. 24 In the year of jubilee the field shall return to him from whom it was bought, to whom the land belongs as a possession. 25 Every valuation shall be according to the shekel of the sanctuary: twenty gerahs  shall make a shekel.
26 “But a firstborn of animals, which as a firstborn belongs to the Lord, no man may dedicate; whether ox or sheep, it is the Lord's. 27 And if it is an unclean animal, then he shall buy it back at the valuation, and add a fifth to it; or, if it is not redeemed, it shall be sold at the valuation.
28 “But no devoted thing that a man devotes to the Lord, of anything that he has, whether man or beast, or of his inherited field, shall be sold or redeemed; every devoted thing is most holy to the Lord. 29 No one devoted, who is to be devoted for destruction  from mankind, shall be ransomed; he shall surely be put to death.
30 “Every tithe of the land, whether of the seed of the land or of the fruit of the trees, is the Lord's; it is holy to the Lord. 31 If a man wishes to redeem some of his tithe, he shall add a fifth to it. 32 And every tithe of herds and flocks, every tenth animal of all that pass under the herdsman's staff, shall be holy to the Lord. 33 One shall not differentiate between good or bad, neither shall he make a substitute for it; and if he does substitute for it, then both it and the substitute shall be holy; it shall not be redeemed.”
34 These are the commandments that the Lord commanded Moses for the people of Israel on Mount Sinai. (ESV)