"on this night": I might think, the entire night; it is, therefore, written (Ibid. 10) "You shall not leave over anything of it until morning, and what is left over of it until morning, in fire shall you burn." What is the intent of (the seemingly superfluous) "until morning"? To set a bound for "the morning of morning." And which is that? The (rising of the) morning star. From here they ruled: The eating of the Paschal lamb and the eating of (other) sacrifices, and the burning of fats and limbs—their mitzvah is until the rising of the morning star. All that is to be eaten in one day—their mitzvah is until the rising of the morning star. And why did they rule ("only) until midnight"? To distance a man from transgression and to make a fence for the Torah and to fulfill the words of the men of the Great Assembly, who said: "Be deliberate in judgment, and set up many disciples, and make a fence for the Torah." R. Eliezer b. Azaryah says: It is written here "on this night," and elsewhere (Ibid. 12) "And I shall pass through the land of Egypt in this night." Just as there, until midnight, so, here, until midnight.