“Most Muslim apologists and also some gullible westerners want to argue that the ‘so called “honor killing” is not Islamic and it’s a tribal/cultural vice.’ This statement is utterly untrue and only a wish full covers up.” -Syed Kamran Mirza-
Quran- 4:15 “If any of your women are guilty of lewdness, take the evidence of four (reliable) witness from amongst you against them; if they testify, confine them to houses until death do claim them. Or God ordain for them some (other) way.”
Sahi Muslim No. 4206:
“A woman came to the prophet and asked for purification by seeking punishment. He told her to go away and seek God’s forgiveness. She persisted four times and admitted she was pregnant. He told her to wait until she had given birth. Then he said that the Muslim community should wait until she had weaned her child. When the day arrived for the child to take solid food, Muhammad handed the child over to the community. And when he had given command over her and she was put in a hole up to her breast, he ordered the people to stone her. Khalid b. al-Walid came forward with a stone which he threw at her head, and when the blood spurted on her face he cursed her.”
More here:
http://www.islam-watch.org/SyedKamra...or_killing.htm