Puisqu'il est interdit de posséder du 'hamets à Pessa'h, tout 'hamets qui se trouve en notre possession doit être vendu à un non-juif. [Tout 'hamets restant en la possession d'un Juif pendant Pessa'h ne peut être utilisé, mangé, acheté ou vendu même après Pessa'h.]

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.

The storage area should be locked or taped shut to be leased to the non-Jew at the time of the chametz sale.

Since there are many legal intricacies in this sale, only a competent rabbi should be entrusted with its execution. The rabbi acts as our agent both to sell the chametz to the non-Jew on the morning before Pesach starts and also to buy it back the evening after Pesach ends.