Reference for Kiddushin 58:13

על בת בההוא בי רבנן אידמי ליה כתנינא דשבעה רישוותיה כל כריעה דכרע נתר חד רישיה אמר להו למחר אי לא איתרחיש ניסא סכינתין

Abaye heard that he was coming. Now, a certain demon haunted Abaye's schoolhouse, so that when [only] two entered, even by day, they were injured. He [Abaye] ordered, 'Let no man afford him hospitality;<span class="x" onmousemove="('comment',' Lit., 'lodging place', so that he might be compelled to spend the night in the academy.');">¹⁷</span>

Jastrow