Not entering a home without first greeting and seeking welcome
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Etiquette of Greeting (Salam)
Not entering a home without first greeting and seeking welcome
"O you who have believed, do not enter houses other than your own houses until you ascertain welcome and greet their inhabitants."
Reference: Qur'an, Surah An-Nur 24:27
Explanation
Greeting is tied directly here to the etiquette of entering someone's private space.