"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 bin 'Umar : The Jew brought to the Prophet a man and a woman from amongst them who have committed (adultery) illegal sexual intercourse. He ordered both of them to be stoned (to death), near the place of offering the funeral prayers beside the mosque." - Sahih Bukhari 7:62:64 (read more)

"Allah says: "There is no compulsion in religion"...But, this verse is abrogated by the verse of "fighting...Therefore, all people of the world should be called to Islam. If anyone of them refuses to do so, or refuses to pay the Jizya they should be fought till they are killed. This is the meaning of compulsion. In the Sahih, the Prophet said: "Allah wonders at those people who will enter Paradise in chains", meaning prisoners brought in chains to the Islamic state, then they embrace Islam..." - Ibn Kathir