Should one nullify chametz a second time during the day on Erev Pesach, and when?
Synopsis
All authorities agree it is proper to nullify a second time during the day on the 14th of Nisan, at the end of the fifth hour before the sixth hour begins. The daytime formula includes 'whether I have seen it or not, whether I have removed it or not.' The Rema rules one should nullify only after burning the chametz, to fulfill the mitzvah of burning one's own chametz.
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