"Until, when he reached the setting of the sun, he found it set in a spring of murky water: Near it he found a People: We said: “O Zul-qarnain! (thou hast authority,) either to punish them, or to treat them with kindness." - Quran 18:86 (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)

"Hence the fuqaha’ of all madhhabs are agreed that circumcision for both men and woman is part of the fitrah of Islam and one of the symbols of the faith, and it is something praiseworthy. There is no report from any of the Muslim fuqaha’, according to what we have studied in their books that are available to us, to say that circumcision is forbidden for men or women, or that it is not permissible, or that it is harmful for females, if it is done in the manner that the Prophet (peace and blessings of Allaah be upon him) taught..." - Shaykh Jaad al-Haqq ‘Ali Jaad al-Haqq