Exodus 12:29-30

29 At midnight the Lord struck down all the firstborn in the land of Egypt, from the firstborn of Pharaoh who sat on his throne to the firstborn of the prisoner who was in the dungeon, and all the firstborn of the livestock.
30 Pharaoh arose in the night, he and all his officials and all the Egyptians; and there was a loud cry in Egypt, for there was not a house without someone dead.

Exodus 12:29-30 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.

Exodus 12:29-30 In-Context

27 you shall say, "It is the passover sacrifice to the Lord, for he passed over the houses of the Israelites in Egypt, when he struck down the Egyptians but spared our houses.' " And the people bowed down and worshiped.
28 The Israelites went and did just as the Lord had commanded Moses and Aaron.
29 At midnight the Lord struck down all the firstborn in the land of Egypt, from the firstborn of Pharaoh who sat on his throne to the firstborn of the prisoner who was in the dungeon, and all the firstborn of the livestock.
30 Pharaoh arose in the night, he and all his officials and all the Egyptians; and there was a loud cry in Egypt, for there was not a house without someone dead.
31 Then he summoned Moses and Aaron in the night, and said, "Rise up, go away from my people, both you and the Israelites! Go, worship the Lord, as you said.
32 Take your flocks and your herds, as you said, and be gone. And bring a blessing on me too!"