Reference for Eruvin 144:1
מיתיבי אמר רבי יהודה הסבר לא נחלקו ב"ש וב"ה על מחיצות המגיעות לתקרה שצריכין עירוב לכל חבורה וחבורה על מה נחלקו על מחיצות שאין מגיעות לתקרה שבית שמאי אומרים עירוב לכל חבורה וחבורה ובית הלל אומרים עירוב א' לכולן
An objection was raised: R'Judah ha-Sabba<span class="x" onmousemove="('comment',' 'The reasoner' or 'interpreter'. R. Han. and Alfasi read: 'ha-Sabbak', 'the net-weaver'. Others 'ha-Saddar', 'who arranges (Mishnahs) in order'.');"><sup>1</sup></span> stated, Beth Shammai and Beth Hillel do not dispute the ruling that where partitions<span class="x" onmousemove="('comment',' Which subdivide a large hall into small compartments.');"><sup>2</sup></span> reach the ceiling a separate contribution to the erub is required on the part of each company; they only differ<span class="x" onmousemove="('comment',' Lit., 'concerning what are they divided?'');"><sup>3</sup></span> where the partitions do not reach the ceiling in which case Beth Shammai maintain that a separate contribution to the 'erub must be made for each company, while Beth Hillel maintain that one contribution to the 'erub suffices for all of them.