"Also (forbidden are) women already married, except those whom your right hands possess. Thus has Allah ordained for you. All others are lawful, provided you seek them from your property, desiring chastity, not fornication. So with those among them whom you have enjoyed, give them their required due, but if you agree mutually after the requirement (has been determined), there is no sin on you. Surely, Allah is Ever All-Knowing, All-Wise." - Quran 4:24 (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)

"The marriage of a Christian man to a Muslim woman is an invalid marriage. Allah says in the Quran, "And give not [Muslim women] in marriage to idolaters until they believe" (al-Baqara 221). Therefore, it is not allowed for a disbeliever to marry a Muslim woman... If he does marry her, the marriage is invalid. The children are the children of fornication. They are to be given to their mother and ascribed to her alone." - Shaikh ibn Baz