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].