Zevachim 10:7-8

Zevachim 10:7

When it comes to sacrifices that may be eaten, the kohanim may vary the style in which they are cooked: roasted, stewed or boiled, and they may add spices that are either chulin (non-sanctified) or trumah; this is the opinion of Rabbi Shimon. Rabbi Meir says that they may not use trumah spices out of concern that doing so might render trumah unfit (should the sacrifice be left beyond its permitted time).

Zevachim 10:8

Rabbi Shimon said that if you see oil being shared in the Temple courtyard, you need not ask what it is because it’s what’s left from the wafers of the Israelites’ flour offerings or the metzora’s log of oil. If you see oil being poured on the altar fire, you need not ask what it is because it’s what’s left from the wafers of the kohanim’s flour offerings or the Kohein Gadol’s daily flour offering. We know all this because oil is never offered as its own freewill offering. Rabbi Tarfon, however, says that oil can be offered as a freewill offering.