The Exodus page 6

Then the Lord said to Moses, “I am going to bring just one more plague on Pharaoh and upon Egypt; afterwards he will actually send all of My people out of Egypt.”

“This plague will bring death to all the firstborn in the land of Egypt, from the firstborn of Pharaoh who sits on a throne, to the firstborn of the maidservant behind the mill. And there shall be a great cry throughout all the land of Egypt, such as has never happened before and shall never be again.”

“Moses, speak to all the congregation of Israel. Tell them I said, Select a lamb, one for each household: Your lamb must a year old male with no imperfections. After four days, the whole assembly of Israel shall kill it in the evening.”

“And you must take a bunch of hyssop, and dip it in the lamb’s blood, and strike the top of the door frame and the two side posts with the blood; and none of you shall go out the door of your houses until the morning. And you must eat the lamb that night, roasted with fire; but do not break any of its bones. You must eat it with unleavened bread because it is the Lord’s Passover.”

Learn more about the Passover and prophecies about the Messiah

“For I will pass through the land of Egypt, and will kill all the firstborn in the land of Egypt, both man and beast. I will execute judgment against all the gods of Egypt: I am the Lord. And the blood shall be a mark of safety on the houses where you are, so when I see the blood, I will not allow the destroyer to come into your houses to smite you. He will pass-over you. And every year after this, you must celebrate the dinner of unleavened bread as a memorial, calling it the Lord’s Passover.”

So the Children of Israel did as the Lord had commanded them through Moses and Aaron.