Chabad.org — English translation + Rashi
Torah Temimah points to Toras Kohanim (Sifra), Vayikra Dibbura DeChovah, on 4:5 (ve-lakach — in a vessel).
Sefaria — Sifra / Toras Kohanim, Vayikra Dibbura DeChovah
English: “And he shall take” — in a vessel, and not by hand.
Blood reception requires a vessel — the blood of the chatas bull is received in a sacred vessel, not by hand alone.
The blood of the chatas bull is received in a sacred vessel, not by hand alone. The Sifra’s reading of “and he shall take” establishes that the reception of the blood must occur in a kli sharet. Direct reception by the hand is excluded, ensuring that the blood enters the sacrificial process only through the proper vessel.