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The Bedika of the Alter Rebbe:
The Alter Rebbe went to Mezritch for the first time in the year 1764 and remained there until a few days before Pesach of 1765. Upon returning home, on the 13th of Nissan, he did not eat due to his preoccupation with the preparations for Bedikas Chametz, assuring that all the Divine intents that he learned in Mezritch regarding the Bedika would be translated into action. The actual Bedika continued throughout the entire night despite the fact that he only had one room in his possession.
 Haggadah of Rebbe; Sefer Hasichos 1938 Chag Hapesach