Leviticus 27:26-27

WEB_Strongs(i)
  26 H1060 "‘Only the firstborn H929 among animals, H1069 which is made a firstborn H3068 to Yahweh, H376 no man H6942 may dedicate H7794 it; whether an ox H7716 or sheep, H3068 it is Yahweh's.
  27 H2931 If it is an unclean H929 animal, H6299 then he shall buy H6187 it back according to your valuation, H3254 and shall add H2549 to it the fifth H1350 part of it: or if it isn't redeemed, H4376 then it shall be sold H6187 according to your valuation.