Exodus 12:16-18

New Revised Standard Version, Anglicised Catholic Edition

¹⁶ On the first day you shall hold a solemn assembly, and on the seventh day a solemn assembly; no work shall be done on those days; only what everyone must eat, that alone may be prepared by you. ¹⁷ You shall observe the festival of unleavened bread, for on this very day I brought your companies out of the land of Egypt: you shall observe this day throughout your generations as a perpetual ordinance. 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.