In Parshas Bo ([12:8][1]) it says about the Korban Pesach: >וּמַצּוֹת עַל מְרֹרִים יֹאכְלֻהוּ but by the Parsha of Pesach Sheni in Bamidbar ([9:11][2]) it says: >עַל מַצּוֹת וּמְרֹרִים יֹאכְלֻהוּ Why the Change in the Language? [1]: http://www.mechon-mamre.org/p/pt/pt0212.htm#8 [2]: http://www.mechon-mamre.org/p/pt/pt0409.htm#11