And he shall offer from the sacrifice of the shelamim as a fire-offering to Hashem: its fat, the entire fat-tail, he shall remove it opposite the backbone…
English: “Its fat, the fat-tail” — to include the fat near the fat-tail, the fat between the loin-sinews; these are the words of R’ Akiva. R’ Yehudah says: “Its fat, the fat-tail” — the fat-tail is juxtaposed to fat; just as (ordinary) fat falls under two prohibitions, so the (consecrated) fat-tail falls under two prohibitions.
In Sifra: Sheep shelamim uniquely require the whole alyah. R’ Akiva expands the adjacent fat that rides with the tail; R’ Yehudah uses the juxtaposition to double the issur on a consecrated alyah. The alyah itself is shuman offered on the altar, not classic cheilev.
Type of Learning
R’ Eliezer #1 (ריבוי) / juxtaposition (hekesh) of alyah to cheilev.
What Is Learned
The fat-tail of a sheep shelamim is wholly removed to the backbone and offered; nearby membrane fat may join it, and the consecrated alyah can carry a doubled prohibition reading.