Leviticus 22:14

14 “ ‘Anyone who eats a sacred offering by mistake must make restitution to the priest for the offering and add a fifth of the value to it.

Read Leviticus 22:14 Using Other Translations

And if a man eat of the holy thing unwittingly, then he shall put the fifth part thereof unto it, and shall give it unto the priest with the holy thing.
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.
“Any such person who eats the sacred offerings without realizing it must pay the priest for the amount eaten, plus an additional 20 percent.