Sforno on Exodus 12:17/ספורנו על שמות י״ב:י״ז

1ושמרתם את המצות, which are called such to reflect the speed with which they have been baked without giving the dough a chance to ferment and rise.

2כי בעצם היום הזה, “on this self-same day;” for on the same day they were all being gathered. They were not being given time to assemble over a period of a few days and nights (seeing that we are speaking of between 2-3 million people)

3הוצאתי את צבאותיכם, the entire community of Israel including their flocks and herds all simultaneously.