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The Shulchan Aruch, the Jewish code of law, teaches us that this Shabbos, the Shabbos preceding Pesach, has a special name; Shabbos Hagadol, The Great Shabbos.
The reason for this name is because the Shabbos before our Exodus all the Jews tied sheep to their bedposts for the sake of slaughtering them four days later. This should have caused an uproar from the Egyptians as they viewed sheep as their deity. However, miraculously not one Egyptian raised a hand against a Jew. Because of this event the Shabbos is referred to as The Great Shabbos.