Exodus 12:19 VOICE

[19] No yeast is to be found in any of your houses during the seven festival days. Whoever eats anything that has yeast in it must be cut off from the community of Israel. It doesn't matter whether he is a foreigner or a native; the same standards apply. During the seven festival days, do not eat anything made with yeast; wherever you live and gather together, be sure you eat only unleavened bread.