Exodus 12:15-18 - The Festival Of Unleavened Bread

¹⁵ Seven days shall ye eat unleavened bread; even the first day ye shall put away leaven out of your houses: for whosoever eateth leavened bread from the first day until the seventh day, that soul shall be cut off from Israel. ¹⁶ And in the first day there shall be to you a holy convocation, and in the seventh day a holy convocation; no manner of work shall be done in them, save that which every man must eat, that only may be done by you.

¹⁷ And ye shall observe the feast of unleavened bread; for in this selfsame day have I brought your hosts out of the land of Egypt: therefore shall ye observe this day throughout your generations by an ordinance for ever. ¹⁸ In the first month , on the fourteenth day of the month at even, ye shall eat unleavened bread, until the one and twentieth day of the month at even.