Midrash sobre Levítico 3:7

2) "korbano" ("his offering") is written three times, to include (in the requirement of semichah) all the partners to an offering (one after the other). (For without the inclusion provision) would it not follow (that they would not all perform semichah?), viz.: If tenufah, which obtains both with living animals (e.g., the Atzereth lambs and the guilt-offering of the metzorah) and with slaughtered animals (e.g., the breast and thigh of peace-offerings and thanksgiving offerings), are excluded (from tenufah by all of the partners, [one performing tenufah for all of them]) — semichah, which obtains only with living animals, how much more so should all of the partners be excluded from it, (and only one perform it for all)! It is, therefore, written: "his offering" — to include (as performing semichah) all of the partners to the offering.

4) (Vayikra 3:7): ("If) a lamb (he offers"): Why mention this (after "flock")? To include the pesach offering (which is a lamb) for the (smoking of the) fat-tail (along with the other devoted portions). "If a lamb" — to include a pesach whose (stipulated) time (for sacrifice) has passed, and shelamim which come by virtue of a pesach (e.g., a substitute) in all the mitzvoth of shelamim, as requiring semichah, libations, and waving of breast and thigh. For I might think: If the "father" (i.e., the pesach offering itself) does not require semichah, libations, and waving of breast and thigh, then what comes because of it, how much more so should it not require semichah, libations, and waving of breast and thigh! It is, therefore, written: "If a lamb" to include a pesach whose time has passed and what comes by virtue of it as requiring semichah, libations, and waving of breast and thigh. But they are eaten only for a day and a night, as per the origin of their consecration (i.e., the pesach offering). Ben Azzai says: They are eaten only at night and only roasted (like the pesach lamb itself).

5) ("If) he (offers"): The individual may bring shelamim as a gift-offering, but not the congregation. If you would ask: But have they (the congregation) not already been excluded by (Vayikra 3:1): "if from the cattle he offers"? (This is no objection,) for I might think that the congregation does not bring shelamim from cattle as a gift-offering because they do not bring their like as a mandatory offering, and that they could bring shelamim from the flock as a gift-offering, because they do bring their like as a mandatory offering (i.e., the Atzereth lambs). It is, therefore, written (here) "he" — The individual may bring shelamim as a gift-offering, but not the congregation.