Numbers 18:8,12,13
And the LORD spoke to Aaron, Behold, I also have given you the charge of my heave offerings of all the hallowed things of the children of Israel; to you have I given them by reason of the anointing, and to your sons, by an ordinance for ever.
Torrey's Topical Textbook—AKJV

Deuteronomy 18:4
The first fruit also of your corn, of your wine, and of your oil, and the first of the fleece of your sheep, shall you give him.
Torrey's Topical Textbook—AKJV