Exodus 12:20

Ye shall eat nothing leavened,.... Bread or anything else that had any leaven in it:

in all your habitations shall ye eat unleavened bread, that is, if they eat any bread at all, it must be such;…

Moses and Aaron here receive of the Lord what they were afterwards to deliver to the people concerning the ordinance of the passover, to which is prefixed an order for a new style to be observed in…