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The Gemara discusses Aharon's answer to Moshe Rabeinu's question about why Aharon did not eat the Korban of Rosh Chodesh when he was explicitly told that he should eat the Korbanos of the Milu'im even though he was an Onen. Aharon explained that perhaps Hash-m had told Moshe Rabeinu that Aharon was permitted to eat Kodshei Sha'ah (Korbanos brought specially for the Milu'im). Aharon did not think that this leniency applied to Kodshei Doros (Korbanos brought in all generations), since the Halachah is that even a Kohen Gadol who is an Onen is not allowed to eat such Korbanos.
The Gemara quotes the verse which relates Moshe Rabeinu's response: "va'Yishma Moshe va'Yitav b'Einav" -- "and Moshe heard and it was good in his eyes" (Vayikra 10:20). The Gemara explains that Moshe admitted to his error and was not embarrassed to say, "That is what I heard, and I forgot," when he could have said, "That is not what I heard.”
We explore the deeper meanings behind their exchange.