This week’s portion begins with the eighth plague that G-d brings upon the Egyptians as the land is covered by locusts, destroying all the remaining crops. After the plague is removed at Pharaoh’s behest, he once again refuses to set free the Jewish people, and the ninth plague of darkness encompasses the land. When that plague ends, Pharaoh becomes even more defiant about not freeing the slaves, at which point Moses warns Pharaoh about the upcoming tenth plague, the death of the firstborn. The Torah then interrupts the narrative with the first mitzvah given to the Jewish people as a nation — the sanctification of Rosh Chodesh (the new month), beginning with the month of Nisan. G-d teaches Moses about the Korban Pesach (Passover offering) and the remainder of the laws of the Passover holiday, which Moses then transmits to the Jewish people.
At midnight of the appointed night the plague strikes, with every non-Jewish first-born dying, including Pharaoh’s own son. Pharaoh awakes, running through the streets (presumably while still in his pajamas) to tell Moses that he now consents to send the Jewish people from his country. The children of Israel travel forth in a hurry with the great wealth they have just been given by the Egyptians. The Torah portion concludes with various mitzvos relating to the Exodus.