Eiruvin 6:2-3

Eiruvin 6:2

Rabban Gamliel’s family once shared an alleyway in Jerusalem with a Sadducee. His father told the family to carry their possessions out before that other resident could impede their ability to do so (that is, once they exercise their right to carry in the alleyway, it can longer be impeded). This assumes that a Sadducee is the same legally as a Jew. Rabbi Yehuda maintains that Sadducees are legally the same as non-Jews and that what Rabban Gamliel’s father said was to do whatever they needed to do in the alleyway before the other resident impedes their ability to do so (which could still happen).

Eiruvin 6:3

If one of the residents of a courtyard forgot to contribute to their communal eiruv, neither he nor the other residents may carry into or out of his house, but he and they may carry into and out of the other residents’ houses. If the other residents renounced their rights to the courtyard in his favor, he may carry to and from his house but they may not. If two residents neglected to contribute to the eiruv, they impede one another from gaining the ability to carry. This is because, while one person may give or take the rights, two people can only give up the rights, they cannot take the rights.