Leviticus 23:20

Wave them — Some part of them in the name of the whole; and so for the two lambs, otherwise they had been too big and too heavy, to be waved. For the priests — Who had to themselves not only the breast and shoulder as in others, which belonged to the priest, but also the rest which belonged to the offerer; because the whole congregation being the offerer here, it could neither be distributed to them all, nor given to some without offence to the rest.