It shall be for Aaron and his sons as a perpetual due from the people of Israel, for it is a contribution. It shall be a contribution from the people of Israel from their peace offerings, their contribution to the LORD.
28. And it shall be Aaron’s. Lest the dignity of the sacred offerings, which are called the holiness of the Lord, should be impaired, strangers are prohibited from partaking of them; for, if it had been permitted that every one should touch them and eat of them, there would have been no distinction between them and ordinary food.
The ceremonies for consecrating Aaron and his sons had to be set down in detail so that they themselves would grasp the weight of what God called them to, and the people would learn to honor the office and keep their hands off it. The Hebrew word for consecrating means filling the hand, which tells us ministers have their hands full, no time for trifling, their work is so great and constant.
AI summary
Commenting on Exodus 29:1-37
And it shall be Aaron's and his sons by a statute for ever from the children of Israel,.... That is, the shoulder, which seems particularly meant, though the breast also was theirs, which was at this time given to Moses, he being priest; and this was an everlasting statute and ordinance in all generations, as long as the priesthood of Aaron lasted, until the Messiah...