"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)

"And he [Muhammad] had their hands and feet cut off. Then he ordered for nails which were heated and passed over their eyes, and whey were left in the Harra (i.e. rocky land in Medina). They asked for water, and nobody provided them with water till they died (Abu Qilaba, a sub-narrator said, 'They committed murder and theft and fought against Allah and His Apostle, and spread evil in the land.')" - Sahih Bukhari 1:3:63 (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