We need not be concerned that a weasel may have dragged [chametz] from house to house or from place to place, for if so, [then we would have to be concerned] from courtyard to courtyard and from town to town, and there would be no end to the matter.

R' Yehudah says: We must search on the evening of the fourteenth, or on the morning of the fourteenth, or at the time of removal.  But the Sages say: If one did not search on the evening of the fourteenth, he must search on the [day of the] fourteenth; if he did not search on the [day of the] fourteenth, he must search during the festival; if he did not search during the festival, he must search after the festival.  That which he leaves over, he should place in hiding, so that it not be necessary to search for it [again].

R' Meir says: We may eat [chametz] the entire fifth [hour], and we must burn [it] at the onset of the sixth [hour].  But R' Yehudah says: We may eat [chametz] the entire fourth [hour], but we suspend [it] the entire fifth [hour], and we must burn it at the onset of the sixth [hour].

R' Yehudah also said: Two loaves of a thanksgiving-offering [which had become] unfit were placed on the roof of the portico. As long as they lay [there] all the people would eat [chametz]. [When] one was removed, they suspended: — they would neither eat nor burn [the chametz]. When both were removed, all the people would begin to burn [their chametz].  Rabban Gamliel says: Nonconsecrated [chametz] may be eaten the entire fourth [hour]; terumah [which is chametz may be eaten] the entire fifth [hour]; and we must burn [all chametz] at the onset of the sixth [hour].