Numbers 18:13 - Wesley's Explanatory Notes

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. Clean — And none else, because these were first offered to God, and by consequence given to priests; but for those which were immediately given to the priests, the clean and unclean might eat of them.