Said R’ Shimon: If you see oil being distributed in the Courtyard, you need not inquire what it is — it is either the remainder of the wafer minchah-offerings of Yisraelim or of the log of oil of a metzora; if you see oil being poured upon the fires you need not inquire what it is — it is either the remainder of the wafer minchah-offerings of Kohanim, or of the minchah-offering of the Anointed Kohen — for oil cannot be donated. R’ Tarfon says: One can donate oil.