Core Text — Toras Kohanim (Sifra), Vayikra Dibbura DeNedavah, on 1:15 (kir — not the foundation)
״עַל קִיר״ — וְלֹא עַל הַיְּסוֹד.
English: “On the wall” — and not on the foundation.
In Sifra: “Kir” is distinguished from the yesod (foundation) of the altar. The blood must reach the wall surface itself, not the lower foundation course.
Type of Learning
Miyut excluding the yesod from “al kir.”
What Is Learned
Mitzuy is on the wall, not on the altar’s foundation. The verse’s choice of “kir” rather than a more general term for the altar’s lower structure is the source for excluding the yesod as a valid target for the drained blood.