beautiful!
Yochol May’Rosh Chodesh
“I might think that the obligation to discuss Yitzias Mitzrayim commences with the first day of the month of Nissan.” (The Pesach Haggadah)
Why might I think this? R’ Avraham ben HaGra z”l (died 1808; son of the Vilna Gaon) explains: The ancient Egyptians worshiped the sheep, and to counter this fallacious belief, Bnei Yisrael were commanded to slaughter sheep for the Korban Pesach. Not coincidentally, the sheep (Aries) is the astrological sign for the month of Nissan. Therefore, I might think that the time to speak of the Exodus and of Hashem’s mastery over all other forces begins on Rosh Chodesh, when the sign of the sheep first ascends.
For the same reason, the Haggadah states that I might think the time to discuss Yitzias Mitzrayim is on the afternoon of Erev Pesach because that is the time when the Korban Pesach was to be shechted.
(Geulat Avraham)