Numbers 18:14-16 Living Bible (TLB)
14-15 So everything that is dedicated to the Lord shall be yours, including the firstborn sons of the people of Israel, and the firstborn of their animals. 16 However, you may never accept the firstborn sons, nor the firstborn of any animals that I do not permit for food. Instead, there must be a payment of two and a half dollars made for each firstborn child. It is to be brought when he is one month old.