Purim 1: Expansion

One who studies Torah from the time he finishes reading the Megillah at night until he begins to read the Megillah in the morning is assured that he has substantially increased his portion in the World To Come. I do not understand the reason , but I accept it because of those who taught this to me. (Chatam Sofer; Derushim V’Agadot: Derush L’Rosh Chodesh Adar)

One who studies the Megillah through the night ensures that the morning reading is not a simple repetition but an opening of an entirely new world. It is the spirit of expansion. (Machberes Avodas Hashem)