(112) Chapter. A man should not stay with a woman in seclusion unless he is a Dhu-Mahram (a person who is legally not allowed to marry that woman, e.g. her father or brother, etc.). (And it is unlawful for one) to enter upon a woman whose husband is absent.

Narrated `Uqba bin 'Amir: Allah's Apostle said, "Beware of entering upon the ladies." A man from the Ansar said, "Allah's Apostle! What about Al-Hamu the in-laws of the wife (the brothers of her husband or his nephews etc.)?" The Prophet replied: The in-laws of the wife are death itself.

Narrated Ibn `Abbas: The Prophet said, "No man should stay with a lady in seclusion except in the presence of a Dhu- Muhram." A man stood up and said, "O Allah's Apostle! My wife has gone out intending to perform the Hajj and I have been enrolled (in the army) for such-and-such campaign." The Prophet said, "Return and perform the Hajj with your wife."