Exodus 29:28

This will belong to Aaron and his sons as a regular portion from the Israelites, for it is the heave offering the Israelites will make to the LORD from their peace offerings.

And it shall be Aaron’s and his sons’ by a statute for ever from the children of Israel: for it is an heave offering: and it shall be an heave offering from the children of Israel of the sacrifice of their peace offerings, even their heave offering unto the LORD.