Kommentar zu Wajikra 8:20

AND THE RAM WAS CUT INTO PIECES. This cutting into pieces was done only after flaying, but Scripture shortened its account here by omitting the flaying, since He had already commanded about it in the section of the burnt-offering.²⁰⁶Above, 1:6. He states [here in this verse], and Moses caused the head, and the pieces to burn [on the altar], which means “at the time of burning it,” namely, after he washed the inwards and the legs in water [mentioned in the following verse]. It is with reference to this that He states, and Moses burnt the whole ram upon the altar,²⁰⁷Verse 21. for after the washing he burnt everything at the same time. Scripture, however, separated them [stating here in Verse 20 that he burnt the head and the pieces, etc., and afterwards in Verse 21 that he washed the inwards and the legs], so as to teach us that the pieces do not need washing.

ויקטר משה את הראש ואת הנתחים ואת הפדר., “Moses burned up the head, the various parts, and the fat parts to go up in smoke.” The meaning is not that Moses burned up all these parts separately at different times, but it means that when the time for burning up these parts had arrived he proceeded to do so, as instructed.