Commentaire sur Le Lévitique 7:30

'ידיו תביאינה וגו‎ HIS OWN HANDS NAMELY SHALL BRING [THE FIRE OFFERINGS OF THE LORD] — This means that the owner’s hand shall be above and the fat and the breasts shall be lying in it, and the priest’s hand shall be beneath (i. e. beneath the hand of the owner) — and thus does he wave them (Menachot 61b).

THE FAT UPON THE BREAST. It appears from this verse according to its plain meaning that the breast was waved with the fat, but not the thigh. Thus the verse which states, And the breasts and the right thigh Aaron waved for a wave-offering,¹⁴⁷Further, 9:21. means that afterwards [after he had waved the fats with the breasts], he waved them [i.e., the breasts and the thigh] by themselves. But our Rabbis have said¹⁴⁸Menachoth 61 b. that the priest placed the fats upon the hand of the owner of the offering, with the breast and thigh above them, [and waved them]. According to their opinion, the reason why waving is mentioned only in connection with the breast, is in order to serve the basis for the interpretation which they have said: “If [the parts which are to be waved] became unclean, but one of them was left [which remained clean], whence do we know that it needs waving? Scripture therefore says, that the breast may be waved.”¹⁴⁹In Verse 30 before us.

'ידיו תביאנה את אישי ה, seeing that the remainder of the animal belongs to the owners who had brought the offering, the owner together with the priest officiating on his behalf, presents this “waving” to G’d, this symbolic action indicating that basically the entire offering is G’d’s even if only the fat on the chest is offered on the altar, the chest itself belonging to the priest. The main reason for the “waving” is on account of that chest, to signal that actually it too belongs to G’d. There was no need to wave the fat, seeing we all know that the fat of every sacrificial animal always belongs to G’d via the altar on which it is burned up.