Haggadah – “The Mitzva of eating Matza was given to the children of Israel even before they departed Egypt, relating to the future exodus, which was to be in haste. It follows that the Mitzva of eating a Matza was given to them while they were still enslaved….”
The Mitzva about eating Matza was given in advance because the Exodus from Egypt happened suddenly, in haste. Suddenly the order came: “In another moment go!,” “And what about the bread, how is it possible to leave without bread?”
So the Mitzva was given in advance to prepare everything so that at the moment of the Exodus, the escape, we would have everything necessary. Even now we are doing this because we are very happy about this, that all of the redemptions happen suddenly. Therefore, we are in hope all the time that at every moment the redemption could come.
Just as they said to them in Egypt: “You are leaving now!” that is what they will say to us today; indeed in a little while there will be a proclamation and we will all go out; we will begin to rise to the level of the redemption. Therefore we are so happy to celebrate this holiday, remembering this miracle every year.
From the 4th part of the Daily Kabbalah Lesson 3/27/14, Writings of Baal HaSulam