A man of Banu Amir told that he asked the Prophet (ﷺ) for permission (to enter the house) when he was in the house, saying: May I enter ? The Prophet (ﷺ) said to his servant: Go out to this (man) and teach him how to ask permission to enter the house, and say to him: "Say : Peace be upon you. May I enter?" The man heard it and said: Peace be upon you! May I enter ? The Prophet (ﷺ) permitted him and he entered.
Sunan Abi Dawud Book 43, Hadith 405
← Previous Hadith Safwan ibn Umayyah sent him with some milk, a young gazelle and some small cucumbers to the Messenger of Allah (ﷺ) when he was in the upper part of Mecca. I entered but I did not give a salutation. He said: Go back and say: "Peace be upon you"! This happened after Safwan ibn Umayyah and embraced Islam. Amr said: Ibn Safwan told me all this on the authority of Kaladah ibn Hanbal, and he did not say: I heard it from him.

Abu Dawud said: Yahya b. Habib said: Umayyah b. Safwan. He did not say: I heard from Kaladah b. Hanbal. Yahya also said: 'Amr b. 'Abd Allah b. Safwan told him that Kaladah b. al-Hanbal told him.

Sunan Abi Dawud Book 43, Hadith 404 Next Hadith → Similarly, Musaddad transmitted it to us saying that Abu 'Awanah related it to us from Mansur. He did not say: "a man of Banu 'Amir".

Sunan Abi Dawud Book 43, Hadith 406