Exodus

¹⁵Seven 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. ¹⁶And in the first day there shall be to you an holy convocation, and in the seventh day an holy convocation; no manner of work shall be done in them, save that which every man must eat, that only may be done of you. ¹⁷And 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. ¹⁸In 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. ¹⁹Seven days shall there be no leaven found in your houses: for whosoever eateth that which is leavened, that soul shall be cut off from the congregation of Israel, whether he be a sojourner, or one that is born in the land. ²⁰Ye shall eat nothing leavened; in all your habitations shall ye eat unleavened bread. ²¹Then Moses called for all the elders of Israel, and said unto them, Draw out, and take you lambs according to your families, and kill the passover.