Rabban Gamliel said: It once happened that a Sadducee lived with us in an alley in Jerusalem, and Father told us: ‘‘Hurry and carry out all your utensils into the alley before he carries out and restricts you.’’ R’ Yehudah related [this] in different terms: ‘‘Hurry and attend to your needs in the alley before it passes and he restricts you.’’

The residents of a courtyard, one of whom forgot to participate in the eruv, his house is restricted with regard to carrying in and carrying out, to him and to them; but theirs are permitted to him and to them. If they ceded their rights to him, he is permitted, but they are restricted. If there were two, they restrict each other; because an individual can cede rights and acquire rights, two can cede rights but cannot acquire rights.