Charles Ellicott Commentary Numbers 15:20

"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." — Numbers 15:20 (ASV)

Of the first of your dough.— Or, mixed meal. The word arisoth is used only in the plural number, and is found only in Nehemiah 10:37 and Ezekiel 44:30, besides this and the following verse.