What if the oil in the Kohen's palm spills before he manages to place iton the Mitaher's head?
Yoma, 61a: It does not prevent the Taharah from taking effect - since the Torah refers to the oil that he placed on the Mitaher's thumb and big toe as "Yeser ha'Shemen, and the oil that he is about to place on his head as "Nosar ba'Shemen" - it transpires that the latter is Nosar of Nosar and is not crucial. 1
What is "ve'Chiper alav ha'Kohen" referring to?
Ramban #1: It refers to the blood of the Asham and the oil, as discussed in Pesukim 14-17. 1
Ramban #2 (citing The Sifra): Tana'im argue about what atones - whether it is the remnant of oil that the Kohen places on the head of the Mitaher (R. Akiva), or the Korban Asham (R. Yochanan ben Nuri) 2 .


