Leviticus 22:14
And if a man shall eat of the holy thing unknowingly, then he shall put to it the fifth part, and shall give it 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 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 to it, and it shall be his.
Leviticus 5:15-19
If a soul shall commit a trespass, and sin through ignorance, in the holy things of the LORD; then he shall bring for his trespass to the LORD a ram without blemish out of the flocks, with thy estimation by shekels of silver, after the shekel of the sanctuary, for a trespass-offering: