Numbers 15:17-21 - Rules For First Fruits
17 And the LORD spake unto Moses, saying, 18 "Speak unto the children of Israel and say unto them, 'When ye be come in to the land whither I will bring you, 19 then when ye will eat of the bread of the land, ye shall give a heave offering unto the LORD. 20 Ye shall give a cake of the first of your dough unto a heave offering: as ye do the heave offering of the barn, even so ye shall heave it. 21 Of the first of your dough ye must give unto the LORD a heave offering, throughout your generations.