What is the significance of "Chodesh ha'Aviv"?
Rashi #1: Nisan is the month when the grain ripens on its stalks. 1
Rashi #2: It means father (first), since it is the month in which the first ripens.
Torah Temimah (in Devarim 16:1, citing the Sifri): Hashem deliberately took us out of Egypt in the month of spring, the ideal month to travel, since it is neither too hot nor too cold. 4 Refer to 13:4:1:1*.
What does the Torah mean when it prohibits appearing before Hashem empty-handed?
Rashi: It means that when performing the Mitzvah of Aliyas ha'Regel, one should take Olos to the Beis-Hamikdash.