Leviticus 22:14
And if a man takes the holy food in error, he will have to give the holy thing back to the priest, with the addition of a fifth part.
Leviticus 27:13
But if he has a desire to get it back for himself, let him give a fifth more than your value.
Leviticus 27:15
And if the owner has a desire to get back his house, let him give a fifth more than your value, and it will be his.
Leviticus 5:15-19
If anyone is untrue, sinning in error in connection with the holy things of the Lord, let him take his offering to the Lord, a male sheep from the flock, without any mark, of the value fixed by you in silver by shekels, by the scale of the holy place.