Albert Barnes Commentary Numbers 15:20-21

"Of the first of your dough ye shall offer up a cake for a heave-offering: as the heave-offering of the threshing-floor, so shall ye heave it. Of the first of your dough ye shall give unto Jehovah a heave-offering throughout your generations." — Numbers 15:20-21 (ASV)

Dough - “ Coarse meal” (Nehemiah 10:37); (Ezekiel 44:30).