Leviticus 9:19

and the fat of the bullock, and of the ram, the tail, and that which covereth the inwards, and the two kidneys, and the caul of the liver;

V’HAMECHASEH’ (AND THAT WHICH COVERETH THE INWARDS). “That is, the fat which covers the inwards.” Thus the language of Rashi. But it does not appear to me to be correct, for why should He mention [only] this particular fat and not the other fats [which were burnt on the altar]? Rather, the word hamechaseh in my opinion is a term for all the fats, since all fats which are burnt on the altar are “covering” [fats]. One is the fat which covereth the inwards,, 3:3, etc. and the second is all the fat that is upon the inwards,, 3:3, etc. and that too “covers” [the inwards]; the fat which is upon the kidneys covers them, as does also the fat which is upon the loins., Verse 4. This is similar to that which the Rabbis have said: “Fat which the meat covers is permissible to be eaten, for the Merciful One said, the fat which is upon the loins [is called ‘fat’], and not that which is within the loins.” This verse is thus a continuation of the above: and Aaron’s sons delivered unto him the blood of the ox and the ram mentioned [in the first part of that verse], and the fat of the ox, but of the ram they presented to him the fat tail and “the fat” [as the word mechaseh indicates], and of the two [the ox and the ram, they presented to him] the kidneys, and the lobe of the liver. Scripture states, And they put the fat upon the breasts, for they placed the fat tail, the kidneys, and the lobe of the liver at the bottom, and the [other] fats on the top of them, and everything upon the breasts. Thus the fats alone were visible above, this being the respectful way to burn them [on the altar].