Leviticus 22:14
And if a man eats a holy thing without knowing it, then he shall put the fifth part to it, and shall give to the priest with the holy thing.
Leviticus 27:13
But if he will at all redeem it, then he shall add a fifth part of it to what you judged.
Leviticus 27:15
And if he who sanctified it desires to redeem his house, then he shall add the fifth part of the silver of your judgment, and it shall be his.
Leviticus 5:15-19
If a soul commits a trespass and sins through ignorance in the holy things of Jehovah, then he shall bring for his trespass to Jehovah a ram without blemish out of the flock, together with an amount set by you, by shekels of silver, after the shekel of the sanctuary, for a trespass offering.