If one had designated [before Yom Tov] black [doves] but [on Yom Tov] found white [doves], [or if he had designated] white [doves] but found black [doves], or [if he had designated] two and found three — they are prohibited. [If he had designated] three but found [only] two — they are permissible. [If the designated doves had been] in the nest, but he found [doves] in front of the nest, they are prohibited. But if there were none there except these, then these are permitted [to be slaughtered].

We mention the Exodus from Egypt at night. R’ Elazar ben Azaryah said: Behold, I am like a seventy-year-old man, yet I did not prevail [with my argument] that the Exodus from Egypt should be mentioned at night, until this was expounded by Ben Zoma: For it is stated: So that you will remember the day of your departure from the land of Egypt all the days of your life (Deuteronomy 16:3.). The days of your life — [this means] the days; all the days of your life — [this includes] the nights [also]. But the Sages say: The days of your life — [this means] this world; all the days of your life — [this comes] to include the days of the Messiah.