'One fifth' in the Bible

And he shall make restitution [for] what he sinned {because of} a holy thing and shall add one-fifth of {its value} onto it and shall give it to the priest. The priest shall make atonement for him with the ram of the guilt offering, and he will be forgiven.

or anything about which he swore falsely; he shall make restitution for it in full and add to it one-fifth more. He shall give it to the one to whom it belongs on the day he presents his guilt offering.

But if a person unknowingly eats a holy gift [which has been offered to God], then he shall add one-fifth of its value to it and give the holy gift to the priest.

But if he should ever wish to redeem it, then he shall add one-fifth of it to your valuation.

Yet if the one who consecrates it should wish to redeem his house, then he shall add one-fifth of your valuation price to it, so that it may be his.

If the one who consecrates it should ever wish to redeem the field, then he shall add one-fifth of your valuation price to it, so that it may pass to him.

But if it is among the unclean animals, then he shall redeem it according to your valuation and add to it one-fifth of it; and if it is not redeemed, then it shall be sold according to your valuation.

If, therefore, a man wishes to redeem part of his tithe, he shall add to it one-fifth of it.