Numbers 15:17

"And Jehovah spake unto Moses, saying, Speak unto the children of Israel, and say unto them, When ye come into the land whither I bring you, then it shall be, that when ye eat of the bread of the land, ye shall offer up a heave-offering unto Jehovah. 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."

"The word [~`aricoth], here rendered "dough," is obscure; and the use of cake in Numbers 15:20 favors the view that it is some kind of cereal food prepared in the home."[5]

"A heave-offering ..." refers to the lifting of the sacrifice in the front of the altar to show that it was given unto Jehovah, and the bringing of it downward was to indicate God's giving it back to the offerer. All of these various ceremonies were discussed in the early chapters of Leviticus.