Menachos Daf 18 מנחוס דַף 18

Yosef HaBavli was once sitting before Rebbe Elazar ben Shamua, to whom he was extremely beloved. Yosef asked Rebbe Elazar about the halachah of shechitah with intent to leave over some of the blood until the next day, and Rebbe Elazar replied that it is כשר. He repeated this ruling several times, but on the fifth time, he added that Rebbe Eliezer says it is invalid. Upon hearing this, צהבו פניו של יוסף הבבלי – Yosef HaBavli’s face lit up. Rebbe Elazar ben Shamua said: יוסף כמדומה אני שלא כיווננו שמועתינו עד עתה – “Yosef, it seems to me that our teaching was not correct until now.” Yosef explained that he reacted this way because he recalled that his former teacher, Rebbe Yehudah, taught him that this case is invalid, but none of Rebbe Yehudah’s other talmidim remembered him saying so. Now that Rebbe Elazar ben Shamua related that Rebbe Eliezer invalidates the korban, החזרת לי אבידתי – “you have returned to me my lost [teaching].” Rebbe Elazar ben Shamua’s eyes flowed with tears, and he said: אשריכם תלמידי חכמים שדברי תורה חביבין עליכם ביותר – “Fortunate are you, Torah scholars, that the words of Torah are especially dear to you!” He applied to Yosef HaBavli this passuk: מה אהבתי תורתך כל היום היא שיחתי – How I love Your Torah; all day it is my conversation!

The next Mishnah states: לא יצק – if one did not pour oil into the minchah (the third and final pouring), 

לא בלל – or he did not mix the oil and flour (but poured the entire לוג in without mixing it), ולא פתת – or he did not break the minchah into pieces (required by all menachos which are baked before kemitzah), or he did not salt it, wave it, bring it near the מזבח, or smear it with oil, the minchah is still valid. The Gemara clarifies that pouring the oil is actually מעכב, and the Mishnah’s case is where the יציקה was performed by a non-Kohen, teaching that this is valid. Still, the Mishnah’s next case of "לא בלל" means that even if it was literally not mixed at all, it is still valid, as Rebbe Zeira taught: כל הראוי לבילה – any [minchah] which is fit for mixing, אין בילה מעכבת בו – actual mixing is not critical to it, and it is valid without it. וכל שאינו ראוי לבילה – But any [minchah] which is not fit for mixing, e.g., if the כלי contained more than sixty issarons of flour, which cannot be mixed properly with the oil, then בילה מעכבת בו – mixing is critical to it, and the minchah is invalid.

Rebbe Shimon taught in a Baraisa: כל כהן שאינו מודה בעבודה – any Kohen who does not accept the avodah (as commanded by Hashem, but believes they were invented by Moshe) אין לו חלק בכהונה – does not receive a portion of the kodashim foods of the Kehunah, because the passuk says: המקריב את דם השלמים ואת החלב מבני אהרן לו תהיה שוק הימין למנה – one who offers the blood of the shelamim and the fat, [one] of the sons of Aharon, the right thigh shall be his as a portion. This teaches that only one who accepts the avodah has a portion of the kodashim foods of the Kehunah, שאינו מודה בעבודה אין לו חלק בכהונה – but one who does not accept the avodah has no portion of the kodashim foods of the Kehunah. He darshens that this applies to fifteen other עבודות: pouring (oil), mixing, breaking (the minchah into pieces), salting, waving, bringing the minchah near, kemitzah, הקטרה, melikah, קבלות – receiving blood in a כלי שרת, sprinkling blood, making a סוטה drink the sotah waters, עריפת העגלה, purification of a metzora, and נשיאות כפים, both inside and outside the Mikdash.