When the Messenger of Allah (ﷺ) came to some people's door, he did not face it squarely, but faced the right or left corner, and said: Peace be upon you! peace be upon you! That was because there were no curtains on the doors of the house at that time.
Reference: Sunan Abi Dawud 5186 In-book : Book 43, Hadith 414 English translation : Book 42, Hadith 5167
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