It is narrated from Sayyiduna Uqbah bin Amir (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Beware of entering upon women." A man from the Ansar said: O Messenger of Allah! What about the husband's brother? He (peace and blessings be upon him) said: "The husband's brother is death."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14834