Exodus 12
15 Ref For seven days let your food be unleavened bread; from the first day no leaven is to be seen in your houses: whoever takes bread with leaven in it, from the first till the seventh day, will be cut off from Israel.
16 Ref And on the first day there is to be a holy meeting and on the seventh day a holy meeting; no sort of work may be done on those days but only to make ready what is necessary for everyone's food.
17 Ref So keep the feast of unleavened bread; for on this very day I have taken your armies out of the land of Egypt: this day, then, is to be kept through all your generations by an order for ever.