An-Nur 24:28

<h2>Seeking Permission and the Etiquette of entering Houses</h2><p>This is the Islamic etiquette. Allah taught these manners (of seeking permission) to His believing servants and commanded them not to enter houses other than their own until they had asked permission, i.e., to ask for permission before entering and to give the greeting of Salam after asking. One should seek permission three times, and if permission is given, (he may enter), otherwise he should go away.It was reported in the Sahih that when Abu Musa asked `Umar three times for permission to enter and he did not give him permission, he went away. Then `Umar said, "Did I not hear the voice of `Abdullah bin Qays asking for permission to enter Let him come in." So they looked for him, but found that he had gone. When he came later on, `Umar said, "Why did you go away" He said, "I asked for permission to enter three times, but permission was not given to me, and I heard the Prophet say,</p><p>«إِذَا اسْتَأْذَنَ أَحَدُكُمْ ثَلَاثًا فَلَمْ يُؤْذَنْ لَهُ فَلْيَنْصَرِفْ»</p><p>(If any one of you asks for permission three times and it is not given, then let him go away.)" `Umar said, "You should certainly …

And if ye find no-one therein, still enter not until permission hath been given. And if it be said unto you: Go away again, then go away, for it is purer for you. Allah knoweth what ye do.

If ye find no one in the house, enter not until permission is given to you: if ye are asked to go back, go back: that makes for greater purity for yourselves: and Allah knows well all that ye do.

And if you find no one therein, still, enter not until permission has been given. And if you are asked to go back, go back, for it is purer for you, and Allah is All-Knower of what you do.

And if you find no one in them, do not enter them until you are given permission. And if it is said to you, “Turn back,” then turn back. That is more proper for you. God is aware of what you do.