Exodus 12:21-31

21 And Moses called all the elders of the children of Israel, and said to them, Go away and take to yourselves a lamb according to your kindreds, and slay the passover.
22 And ye shall take a bunch of hyssop, and having dipped it into some of the blood that is by the door, ye shall touch the lintel, and upon both door-posts, even of the blood which is by the door; but ye shall not go out every one from the door of his house till the morning.
23 And the Lord shall pass by to smite the Egyptians, and shall see the blood upon the lintel, and upon both the door-posts; and the Lord shall pass by the door, and shall not suffer the destroyer to enter into your houses to smite .
24 And keep ye this thing as an ordinance for thyself and for thy children for ever.
25 And if ye should enter into the land, which the Lord shall give you, as he has spoken, keep this service.
26 And it shall come to pass, if your sons say to you, What is this service?
27 that ye shall say to them, This passover is a sacrifice to the Lord, as he defended the houses of the children of Israel in Egypt, when he smote the Egyptians, but delivered our houses.
28 And the people bowed and worshipped. And the children of Israel departed and did as the Lord commanded Moses and Aaron, so did they.
29 And it came to pass at midnight that the Lord smote all the first-born in the land of Egypt, from the first-born of Pharao that sat on the throne, to the first-born of the captive-maid in the dungeon, and the first-born of all cattle.
30 And Pharao rose up by night, and his servants, and all the Egyptians; and there was a great cry in all the land of Egypt, for there was not a house in which there was not one dead.
31 And Pharao called Moses and Aaron by night, and said to them, Rise and depart from my people, both ye and the children of Israel. Go and serve the Lord your God, even as ye say.

Exodus 12:21-31 Meaning and Commentary

INTRODUCTION TO EXODUS 12

This chapter begins with observing, that the month in which the above wonders were wrought in Egypt, and the following ordinance appointed to the Israelites, should hereafter be reckoned the first month in the year, Ex 12:1,2 on the tenth day of which a lamb here described was to be taken and kept till the fourteenth, and then slain, and its blood sprinkled on the posts of the houses of the Israelites, Ex 12:3-7, the manner of dressing and eating it is shown, Ex 12:8-11 and the reason of the institution of this ordinance being given, Ex 12:12-14, and an order to eat unleavened bread during seven days, in which the feast was to be kept, Ex 12:15-20, directions are also given for the immediate observance of it, and particularly about the sprinkling of the blood of the lamb, and the use of it, Ex 12:21-23, and this ordinance, which they were to instruct their children in, was to be kept by them in succeeding ages for ever, Ex 12:24-27 about the middle of the night it was first observed, all the firstborn in Egypt were slain, which made the Egyptians urgent upon the Israelites to depart in haste, Ex 12:28-33 and which they did with their unleavened dough, and with great riches they had borrowed of the Egyptians, Ex 12:34-36, the number of the children of Israel at the time of their departure, the mixed multitude and cattle that went with them, their baking their unleavened cakes, the time of their sojourning in Egypt, and of their coming out of it that night, which made it a remarkable one, are all particularly taken notice of, Ex 12:37-42, laws and rules are given concerning the persons that should partake of the passover, Ex 12:43-49 and the chapter is concluded with observing, that it was kept according to the command of God, and that it was on the same day it was first instituted and kept that Israel were brought out of Egypt, Ex 12:50,51.

The Brenton translation of the Septuagint is in the public domain.