Ubaid bin Umair said: Abu Musa asked Umar for permission to enter the house. This version has: he went with Abu sa’ld who testified to it. He said Did this practice of the Messenger of Allah ﷺ remain hidden from me? My engagement in the transaction in the market made me oblivious of it. Now give me salutation as you wish; and do not ask permission.
Hadith Referenceسنن ابي داود / أبواب النوم / 5182
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح بخاري (2062) صحيح مسلم (2153)
Hadith Takhrij« انظر حدیث رقم : (5180)، (تحفة الأشراف: 4146) (صحیح) » (لیکن آخری ٹکڑا '' جتنی بار چاہو... '' صحیح نہیں ہے، اور یہ صحیحین میں ہے بھی نہیں)