Hagadah and Women's Obligation in Three Mitzvos

הגדה
This word Hagadah is related to the word Aggadah, since the ה and the א are interchangeable letters. Based on this principal of interchanging of the letters א and ה, we can understand a sign established for the three mitzvos (even though they are time-bound, positive mitzvos), for which woman are obligated since they were involved in the miracle: הגדה (telling the story of the Going Out of Egypt), מגילה (reading on Purim), and נר חנוכה (lighting of the Chanukah candles).

The sign for these mitzvos is attached to the verse in Parsha Naso (Bemidbar 5, 22) ואמרה אמן “and she shall say Amen.” The allusion is that she (women) are involved in the three Mitzvos which are expressed as Roshei Taivos for Amen א (ה)גדה ,מגילה, נר חנוכה