Leviticus 22:14
And if a man eats of the holy thing by error, then he shall add the fifth part thereof unto it and shall give it unto the priest with the offering that he ate.
Leviticus 27:13
But if it must be redeemed, then they shall add a fifth part thereof unto thy estimation.
Leviticus 27:15
And if he that sanctified it will redeem his house, then he shall add the fifth part of the money of thy estimation unto it, and it shall be his.
Leviticus 5:15-19
When any person commits a trespass and sins through ignorance, in the holy things of the LORD, then he shall bring for the expiation of his guilt unto the LORD a ram without blemish out of the flocks, in thy estimation of two shekels of silver, after the shekel of the sanctuary, for his guilt;