Exodus 29:26-28

26-28. Be thy part As the officiating minister on this extraordinary occasion, Moses was to receive the breast of the ram of Aaron’s consecration. And here it is enunciated as a statute for ever, that the breast of the wave offering and the shoulder of the heave offering shall belong to the priests as their lawful portion of the peace offerings . These were evidently regarded as choice portions of the animal . The distinction between the wave offering ( תנופה ) and the heave offering ( תרומה ) is indicated by the Hebrew names, the former signifying horizontal motion to and fro, the latter vertical motion, perpendicular to the horizon . These constituted a double form of symbolical consecration, in adoration to Him who rules in all and over all .