Comentario sobre Exodo 29:27

וקדשת את חזה התנופה ואת שוק התרומה וגו׳ AND THOU SHALT SANCTIFY THE BREAST OF THE WAVE OFFERING AND THE SHOULDER OF THE HEAVE OFFERING etc. — Declare these portions of the animal to have a sacred character for future generations in that the heaving of them and the waving of them shall be practised in respect of the breast and the shoulder of all peace-offerings, but the similarity between the שלמים and the מלואים shall not extend to burning the shoulder as was done in the case of the מלואים but (v. 28) “it shall be for Aaron and his sons” to be eaten.

מאשר לאהרון ומאשר לבניו. "of that which is Aaron's and of that which is his sons'". Why was this phrase needed at all? Perhaps the Torah meant to inform us that Moses was allowed to eat these parts only in this instance. He would not be permitted to eat of the breast or thigh of any other sacrificial offerings in the future, they would be exclusively Aaron's and his sons.

וקדשת את חזה התנופה ואת שוק התרומה; both the word וקדשת and the word תנופה indicate that the object is to be set aside, treated as something apart. When speaking of the chest the Torah uses the term תנופה, seeing only it was “waved” as part of the procedure; it was consumed by the priests. The thigh was burned up on the altar. However, on future occasions of sacrificial offerings of which the priests were allocated parts of the sacrificial meat, both were to be consumed by the priests.