Exodus 12
18 Ref `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 Ref 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;