Quran 24:27 — Light (Al-Noor)

O you who believe, do not enter homes other than yours without permission from their inhabitants, and without greeting them. This is better for you, that you may take heed.

[24:26] The bad women for the bad men, and the bad men for the bad women, and the good women for the good men, and the good men for the good women. The latter are innocent of such accusations. They have attained forgiveness and a generous reward.

[24:28] If you find no one in them, do not enter them until you obtain permission. If you are told, "Go back," you must go back. This is purer for you. GOD is fully aware of everything you do.