Numbers 18:14-16 New Life Version (NLV)
14 Everything in Israel that has been set apart to the Lord will be yours. 15 Every first-born of all flesh, man or animal, which they give to the Lord, will be yours. But you must pay the price and make free the first-born of man and the first-born of animals that are unclean. 16 You must make them free when they are one month old. The price to free them will be five large pieces of silver, the price decided upon at the meeting tent. One large piece of silver is worth twenty small pieces of silver.