Leviticus 27:27
add <03254> [and shall add.]
This was probably intended to prevent rash vows and covetous redemptions. The priest alone was to value the thing; and to whatever his valuation was, a fifth part must be added by him who wished to redeem it.
Leviticus 5:16
thing ...... restore .................... atonement <07999 03722> [make.]
fifth <02549> [the fifth.]
priest .... priest <03548> [and the priest.]