A Visitor looking around the House

‘Abdullâh b. Mas’ûd – Allah be pleased with him – went to visit someone who was ill, and a group of people went with him. In the house (where they were visiting) was a woman. One of the visitors, a man, started to look at the woman. ‘Abdullâh [Ibn Mas’ûd] said to him, “If your eye had been gouged out (or popped out] it would have been better for you.”

Al-Bukhârî, Al-Adab Al-Mufrad. See Shaykh Al-Albânî’s Sahîh Al-Adab Al-Mufrad Vol.1 p212.

More:

1. From the Etiquette of a Son with his Father
2. The person who has a need should come to the one he needs [Etiquette]
3. Going out to Spread Greetings
4. Hospitality and Sharing: How the Salaf Lived
5. Sleeping during the day [best and worst times]
6. Supplicating for an Unbeliever
7. The Recommendation for Men to Smell Pleasant [wearing perfume]