Ibn Abbas said: Most of the people did not act upon the verse about asking permission to enter the house. I have commanded this slave-girl of mine to ask my permission to enter. Abu Dawud said: Ata also transmitted it from Ibn Abbas in a similar way. He commanded to act upon this.
Hadith Referenceسنن ابي داود / أبواب النوم / 5191
Hadith Gradingالألبانی:صحيح الإسناد موقوف | زبیر علی زئی:ضعيف, إسناده ضعيف, سفيان بن عينة مدلس و عنعن, وكان يدلس عن الثقات والمدلسين والضعفاء, انوار الصحيفه، صفحه نمبر 179