Chabad.org — English translation + Rashi
Torah Temimah points to Toras Kohanim (Sifra), Vayikra Dibbura DeChovah, on 4:6.
Sefaria — Sifra / Toras Kohanim, Vayikra Dibbura DeChovah
English: “Seven times” — seven times, and not seven drops.
Miyut of drop-counting — each of the seven applications is a full sprinkling, not a single drop.
Each of the seven applications is a full sprinkling, not a single drop. The Torah’s language “seven times” is read as requiring seven complete acts of haza’ah rather than seven discrete drops of blood. This preserves the integrity of the blood service of the High Priest’s chatas and distinguishes it from a merely quantitative counting of drops.