Reference for Eruvin 142:8
אמר רב יוסף מנא אמינא לה דאמר רב יהודה אמר רב הלכה כר"מ ואמר רב ברונא אמר רב הלכה כר"א בן תדאי מ"ט לאו משום דחד טעמא הוא
maintain that it is permissible to rely on it.<span class="x" onmousemove="('comment',' No 'erub, therefore, is required. Since the residents are united by shittuf in their alley they are also deemed to be united in their courtyards; and they are consequently permitted to convey objects from one courtyard into another through doors that open from one into the other.');"><sup>25</sup></span> Said R'Joseph: Whence do I derive this?<span class="x" onmousemove="('comment',' That the point at issue between R. Eleazar b. Taddai and the Rabbis is the Question whether shittuf can also serve the purpose of 'erub.');"><sup>26</sup></span> [From the following:] Since Rab Judah stated in the name of Rab, 'The halachah is in agreement with R'Meir'<span class="x" onmousemove="('comment',' That it is not permissible to rely upon shittuf where an 'erub is required.');"><sup>27</sup></span> and R'Berona stated in the name of Rab, 'The halachah is in agreement with R'Eleazar B'Taddai'.<span class="x" onmousemove="('comment',' That 'in either case' an erub must be prepared.');"><sup>28</sup></span>