Numbers 18:11-12

11This also is yours: the heave offering of their gift, including all the wave offerings of the Israelites. I have given them to you and to your sons and to your daughters with you as a continual allotment; everyone in your household who is [ceremonially] clean may eat it.

12All the best of the fresh [olive] oil, and all the best of the new wine and of the grain, the first fruits of those which they give to the Lord, I give them to you.