'Redeem' in the Bible

Everything that opens the womb, of all flesh which they offer to Yahweh, both of man and animal shall be yours: nevertheless you shall surely redeem the firstborn of man, and you shall redeem the firstborn of unclean animals.

You shall redeem those who are to be redeemed of them from a month old, according to your estimation, for five shekels of money, after the shekel of the sanctuary (the same is twenty gerahs).

"But you shall not redeem the firstborn of a cow, or the firstborn of a sheep, or the firstborn of a goat. They are holy. You shall sprinkle their blood on the altar, and shall burn their fat for an offering made by fire, for a pleasant aroma to Yahweh.