Since it is prohibited to possess chametz on Pesach, any chametz left undisposed must be sold to a non-Jew. [Any chametz remaining in the possession of a Jew during Pesach may not be used, eaten, bought or sold even after Pesach.] Therefore, all chametz that will not be eaten or burned before Pesach and all chametz utensils that will not be thoroughly cleaned by then should be stored away.
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