TT #17 · Parshas Shemini · Aliyah 1 · Passuk 1
Chabad.org — Vayikra Chapter 9 with Rashi
Sifra (Toras Kohanim), Shemini, Mekhilta de-Miluim II 9.
Sefaria — Sifra, Shemini, Mekhilta DeMiluim II 9
English: “And he made it a sin-offering as the first.” Just as the first required the application of the blood and its placement on the four corners, so too this offering required the same procedure.
Analogy — the wording of the passuk is used to derive the stated teaching.
The people's sin-offering is treated like the first sin-offering with respect to applying its blood and the four corners of the altar.