Quotation for Temurah 3:20
וסמיכה גופה מנלן
Just as in the case of the final act, an heir cannot lay hands [on the head of a sacrifice], so in the case of the preliminary act, an heir cannot effect exchange [with his father's dedication].
Sifra
3) "his offering," and not the offering of another; "his offering," and not the offering of a gentile; "his offering," and not the offering of his (deceased) father. These are the words of R. Yehudah, who says that an heir does not perform semichah.
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