Leviticus 27:9-13 - Redemption Of Vowed Animals
9 And if it is a beast of which they bring near an offering to Jehovah, all that one giveth of it to Jehovah is holy; 10 he doth not change it nor exchange it, a good for a bad, or a bad for a good; and if he really change beast for beast, -- then it hath been -- it and its exchange is holy.
11 And if it is any unclean beast of which they do not bring near an offering to Jehovah, then he hath presented the beast before the priest, 12 and the priest hath valued it; whether good or bad, according to thy valuation, O priest, so it is; 13 and if he really redeem it, then he hath added its fifth to thy valuation.