Rif Beitza 3a {Beitza 5b continues; 6a}

beitza 3a

{Beitza 5b continues}
an egg is forbidden {on the second day}. For would Rabban Yochanan ben Zakkai not admit that if witnesses come from michna and on, they treat both that day and the next day as holy? {For the edict was only in terms of counting from each day, but the holiness aspect of it stuck as with the original edict.} Thus, it is clear that they have a single holiness, and an egg would be forbidden on both of them {the days of Rosh haShana}.
And we derive from this that residents of Eretz Yisrael are required to make two days of Yom Tov of Rosh haShana.

{Beitza 6a}
Rava said: A corpse on the first day of Yom Tov, gentiles deal with it. On the second day of Yom Tov, Israelites deal with it. And even on the two days of Yom Tov of Rosh haShana {this distinction is made}, which is not the case as regards an egg.

Rav Zutra {our gem: Mar Zutra} said: They only said this where it {the burial} had been delayed {and they feared the corpse would rot}, but if had not already been delayed, we postpone it {until after Yom Tov}.
And Rav Ashi said: Even if had not been delayed, we do not postpone it.
What is the reason? Yom Tov as regards a corpse the Sages made like weekday, and even to cut shrouds for it or to cut myrtles for it.

Ravina was sitting before Rav Ashi on the two days of Yom Tov