And it shall be Aaron's and his sons' by a statute forever from the children of Israel: for it is a heave offering: and it shall be a heave offering from the children of Israel of the sacrifice of their peace offerings, even their heave offering unto the LORD.
Read Chapter 29
George Leo Haydock
Israel. As these parts have been offered by Aaron to the Lord, so the Israelites shall present them to him and his sons, when they offer sacrifice. (Menochius)
All the different kinds of victims were immolated on this occasion, because the priests were consecrated to offer them all. (Du Hamel)
Again, the breast of the victim together with the shoulder are assigned to him for eating, so that he may learn to immolate to the Giver of all things those parts of himself which correspond to the parts of the sacrifice which he is ordered to take. Not only in his heart must he have right thoughts, but also he must invite those who behold him, by the shoulder of his deeds to sublime heights. He may not covet the good things of this present life nor fear any adversity. He must despise the blandishments of the world by heeding the fear they inspire in his conscience yet despise all fears in view of the sweet delights which his conscience holds out to him.