Leviticus 6:3

Sweareth falsely His oath being required, seeing there was no other way of discovery left. And is guilty Makes his guilt manifest by his voluntary confession upon remorse; whereby he reapeth this benefit, that he only restores the principal with the addition of a fifth part; whereas, if he were convicted of his fault, he was to pay in some cases five-fold, in some four-fold, in others double.