"Prohibited to you (For marriage) are:- Your mothers, daughters, sisters; father's sisters, Mother's sisters; brother's daughters, sister's daughters; foster-mothers (Who gave you suck), foster-sisters; your wives' mothers; your step-daughters under your guardianship, born of your wives to whom ye have gone in,- no prohibition if ye have not gone in;- (Those who have been) wives of your sons proceeding from your loins; and two sisters in wedlock at one and the same time, except for what is past; for Allah is Oft-forgiving, Most Merciful;" - Quran 4:23 (read more)

"Narrated Abdullah ibn AbuDhubab: Iyas ibn Abdullah ibn AbuDhubab reported the Apostle of Allah (peace be upon him) as saying: Do not beat Allah's handmaidens, but when Umar came to the Apostle of Allah (peace be upon him) and said: Women have become emboldened towards their husbands, he (the Prophet) gave permission to beat them." - Sunan Abu Dawud 11:2141 (read more)

"We must know that [wife] beating is a punishment in Islamic religious law,....No one should deny this because this was permitted by the Creator of Man, and because when you purchase an electric appliance or a car you get instructions – a catalogue, explaining how to use it. The Creator of Man has sent down this book [the Quran] in order to show man which ways he must choose....We shouldn't be ashamed before the nations of the world who are still in their days of ignorance, to admit that these [beatings] are part of our religious law..." - Muslim cleric on Qatar TV