Numbers 18:11, 18-19

“All the sacred offerings and special offerings presented to me when the Israelites lift them up before the altar also belong to you. I have given them to you and to your sons and daughters as your permanent share. Any member of your family who is ceremonially clean may eat of these offerings.

The meat of these animals will be yours, just like the breast and right thigh that are presented by lifting them up as a special offering before the altar. Yes, I am giving you all these holy offerings that the people of Israel bring to the LORD. They are for you and your sons and daughters, to be eaten as your permanent share. This is an eternal and unbreakable covenant between the LORD and you, and it also applies to your descendants.”