"The punishment of those who wage war against Allah and His Messenger, and strive with might and main for mischief through the land is: execution, or crucifixion, or the cutting off of hands and feet from opposite sides, or exile from the land: that is their disgrace in this world, and a heavy punishment is theirs in the Hereafter;" - Quran 5:33 (read more)

"Narrated Qatada: Anas bin Malik said, "The Prophet used to visit all his wives in a round, during the day and night and they were eleven in number." I asked Anas, "Had the Prophet the strength for it?" Anas replied, "We used to say that the Prophet was given the strength of thirty (men)." And Sa'id said on the authority of Qatada that Anas had told him about nine wives only (not eleven)." - Sahih Bukhari 1:5:268 (read more)

"Hadeeth indicates that it is obligatory for women to cover their feet, and that this was something that was well known among the women of the Sahaabah (may Allaah be pleased with them). The feet are undoubtedly a lesser source of temptation than the face and hands, so a warning concerning something that is less serious is a warning about something that is more serious and to which the ruling applies more." - Islam Q&A