John Gill Commentary Numbers 18:12

"All the best of the oil, and all the best of the vintage, and of the grain, the first-fruits of them which they give unto Jehovah, to thee have I given them." — Numbers 18:12 (ASV)

All the best of the oil, and all the best of the wine, and of
the wheat
Or the "fat" ^F9 of them; the fat of anything being the best, see (Deuteronomy 32:14); the firstfruits of them :
the oil, and wine, and wheat: which they shall offer unto the Lord, them have I given thee ;
this Jarchi calls the great heave offering, the firstfruits of their harvest and vintage, which being offered to the Lord, was given to the priests: the quantity is not fixed, but left to the generosity of the people, and was a free gift; liberal men would give a fortieth part, those of a meaner spirit a fiftieth, and niggardly ones a sixtieth, and less than that was not given.

(See Gill on Exodus 22:29); compare with this (Ezekiel 45:13).

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FOOTNOTES:

• F9: (blx) "pinguedinem", Pagninus, Montanus