An-Nur 28-31, The Noble Qur'an (Juz'-18, Page-353)

24/An-Nur-28: And if you do not find any one therein, then do not enter them until permission is given to you. And if you are asked to go back, then go back; this is purer (appropriate) for you; and Allah is All-Knowing of what you do.

24/An-Nur-29: There is no sin on you that you enter uninhabited houses wherein is a benefit with your presence. And Allah knows what you do openly and what you hide.

24/An-Nur-30: Say to the believing men that they cast down their looks (they keep away from prohibited), guard their chastity; that is purer for them. Surely Allah is All-Aware of what they do.

24/An-Nur-31: And say to the believing women that they cast down their looks (they keep away from prohibited) and guard their chastity. They should not display their ornaments except what is visible (hands, face and feet), and let them wear (cover) their head-coverings over their collar. And they should not display their ornaments except to their husbands or their fathers, or the fathers of their husbands, or their sons, or the sons of their husbands, or their brothers, or their brothers’ sons, or their sisters’ sons, or women, or those whom their right hands possess (concubines), or the male servants not having need of women, or the children who have not attained knowledge of what is hidden of women. And let them not strike their feet so that what they hide of their ornaments may be known. O believers repent to Allah altogether! So that you may have Salvation.