It is customary on the day for the Pesach that we rid our homes of anything containing leaven. As we discard or burn the vestiges of what is left over we traditionally say:
"All leaven or anything leavened which is in my possession, whether I have seen it or not, whether I have observed it or not, whether I have removed it or not, shall be considered nullified and ownerless as the dust of the earth."
Others seek to add the spiritual dimension of ridding ourselves of leaven saying:
Make all the sitra achara (negative forces), all the kelipot, and all wickedness be consumed in smoke, and remove the dominion of evil from the earth. Remove with a spirit of destruction and a spirit of judgment all that distresses the Shechina, just as You destroyed Egypt and its idols in those days, at this time. Amen, Selah.
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