Exodus 12:17-19

Young's Literal Translation

¹⁷ and ye have observed the unleavened things, for in this self-same day I have brought out your hosts from the land of Egypt, and ye have observed this day to your generations -- a statute age-during.

¹⁸ `In the first [month], in the fourteenth day of the month, in the evening, ye do eat unleavened things until the one and twentieth day of the month, at evening;

¹⁹ seven days leaven is not found in your houses, for any [one] eating anything fermented -- that person hath been cut off from the company of Israel, among the sojourners or among the natives of the land;