Numbers 18:13 - Joseph Benson’s Commentary on the Old and New Testaments

Whatsoever is first ripe Not only the first-fruits of the oil, and wine, and wheat, now mentioned, but all other first-fruits of all other grains, and all fruit-trees. Every one that is clean And none else, because these fruits were first offered to God, and by consequence given to the priests; but for those which were immediately given to the priests, the clean and unclean might eat of them.