Ubayd bin Umayr reported,

Abu Musa asked permission to enter Umm Umar's presence, with this story being mentioned. In it he said, He took Abu Saeed along, who testified on his behalf. Umar then said, "This matter of the Messenger of Allah ﷺ was hidden from me. Busy trading in the markets distracted me from it. But greet as much as you wish, and do not seek permission."

Abu Dawud 5182

Sahih

حدثنا يحيى بن حبيب حدثنا روح حدثنا ابن جريج قال أخبرني عطاء

عن عبيد بن عمير

أن أبا موسى استأذن على عمر بهذه القصة قال فيه فانطلق بأبي سعيد فشهد له فقال أخفي علي هذا من أمر رسول الله ﷺ ألهاني السفق بالأسواق ولكن سلم ما شئت ولا تستأذن

أبو داود 5182صحيح
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How many times a man gives salam when seeking permission
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Darussalam 5182
Abu Dawud 5182