Quran 24:28 — Light (Al-Noor)

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.

[24:27] 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.

[24:29] You commit no error by entering uninhabited homes wherein there is something that belongs to you. GOD knows everything you reveal, and everything you conceal.