Exodus 12:17-27

17 And ye shall observe the feast of unleavened bread, for in this same day have I brought your hosts out of the land of Egypt; therefore, shall ye observe this day for your ages by an ordinance forever.
18 In the first month, on the fourteenth day of the month in the evening, ye shall eat unleavened bread until the twenty-first day of the month in the evening.
19 For seven days there shall be no leaven found in your houses; for whoever eats that which is leavened, that soul shall be cut off from the congregation of Israel, whether he is a stranger or born in the land.
20 Ye shall eat nothing leavened; in all your habitations ye shall eat unleavened bread.
21 Then Moses called for all the elders of Israel and said unto them, Draw out and take lambs according to your families and sacrifice the passover.
22 And ye shall take a bunch of hyssop and dip it in the blood that is in the basin and touch the lintel and the two side posts with the blood that is in the basin; and none of you shall go out of the door of his house until the morning.
23 For the LORD will pass through smiting the Egyptians, and when he sees the blood upon the lintel and on the two side posts, the LORD will pass over that door and will not allow the destroyer to come in unto your houses to smite you.
24 And ye shall observe this thing for an ordinance to thee and to thy sons forever.
25 And it shall come to pass, when ye have entered into the land which the LORD will give you, according as he has promised, that ye shall keep this service.
26 And it shall come to pass, when your children shall say unto you, What do you mean by this service?
27 That ye shall say, It is the sacrifice of the LORD’s passover, who passed over the houses of the sons of Israel in Egypt, when he smote the Egyptians and delivered our houses. Then the people bowed and worshipped.
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