Exodus 12:18-20

New Revised Standard Version, Anglicised Catholic Edition

¹⁸ In the first month, from the evening of the fourteenth day until the evening of the twenty-first day, you shall eat unleavened bread. ¹⁹ For seven days no leaven shall be found in your houses; for whoever eats what is leavened shall be cut off from the congregation of Israel, whether an alien or a native of the land. ²⁰ You shall eat nothing leavened; in all your settlements you shall eat unleavened bread.