Qutaybah ibn Sa'id narrated to us: Layth narrated to us. (Another chain:) Muhammad ibn Rumh narrated to us: al-Layth informed us, from Yazid ibn Abi Habib, from Abi al-Khayr, from 'Uqbah ibn 'Amir, that the Messenger of Allah (peace be upon him) said: "Beware of entering upon women." A man from the Ansar said: "O Messenger of Allah, what do you think about the husband's brother (al-hamw)?" He said: "The husband's brother is death."