Numbers 18:11-12

11“This also is yours: the heave offering of their gift, with all the wave offerings of the children of Israel; I have given them to you, and your sons and daughters with you, as an ordinance forever. Everyone who is clean in your house may eat it.

12“All the best of the oil, all the best of the new wine and the grain, their firstfruits which they offer to the Lord, I have given them to you.