Leviticus 22:14
And if anyone eats of a holy thing unintentionally, he shall add the fifth of its value to it and give the holy thing to the priest.
Leviticus 27:13
But if he wishes to redeem it, he shall add a fifth to the valuation.
Leviticus 27:15
And if the donor wishes to redeem his house, he shall add a fifth to the valuation price, and it shall be his.
Leviticus 5:15-19
"If anyone commits a breach of faith and sins unintentionally in any of the holy things of the LORD, he shall bring to the LORD as his compensation, a ram without blemish out of the flock, valued in silver shekels, according to the shekel of the sanctuary, for a guilt offering.