Reference for Chullin 247:75

אין ואלא עולא ארישא אמרה ניהליכו

By God!' said R'Ammi, 'even i Joshua the son of Nun had told it me by his own mouth I should not have accepted it!' When Rabin came down with all the company<span class="x" onmousemove="('comment',' ; the scholars who used to travel to and fro between Palestine and Babylon reporting teachings of the one country to the other.');"><sup>34</sup></span>