Leviticus 27:31-33

Living Bible

³¹ If anyone wants to buy back this fruit or grain, he must add a fifth to its value. ³² And the Lord owns every tenth animal of your herds and flocks and other domestic animals, as they pass by for counting. ³³ The tenth given to the Lord shall not be selected on the basis of whether it is good or bad, and there shall be no substitutions; for if there is any change made, then both the original and the substitution shall belong to the Lord, and may not be bought back!”