Numbers 15:19

“Then it shall be, that when ye eat of the bread of the land, etc.] Of the land of Canaan; when they were about to eat of it, before they actually did; when they were preparing for it, had ground their corn into flour, and had mixed it with water and kneaded it into dough, in order to bake it and make it fit for food; by bread is meant bread corn, such as was the old corn of the land the Israelites first ate of when they entered into it, (<060511>Joshua 5:11,12); the Targum of Jonathan adds, “not of rice, or millet, or pulse,” but what was made of corn used for bread; and the Jews say f200, there were five things only they were obliged to make the cake of, wheat, barley, “cusmin” or rye, fox…”

“when ye eat of the bread of the land, ye shall offer up an heave offering--The offering prescribed was to precede the act of eating. unto the Lord--that is, the priests of the Lord (Eze 44:30).”

“When ye eat - When you are about to eat it: for before they eat it, they were to offer this offering to God. The bread - That is, the bread - corn. Numbers 15:20”

“The oblation before prescribed seems to have been a general acknowledgment from the people at large; but this was an oblation from every one that reaped a harvest. who was required, previously to tasting it himself, to offer a portion of dough as a heave-offering to the Lord. This is supposed to have been given to the priests in their several cities, and not carried to the tabernacle. Jos 5:11, Jos 5:12 Numbers 15:20”