Sunan Abi Dawud 5177
سنن أبي داود#5177SahihNarrated Rib'i: 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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Shuaib Al ArnautSahih Lighairihi
Zubair Ali ZaiIsnaad Sahih
In-book reference: 43:405