"The punishment of those who wage war against Allah and His Messenger, and strive with might and main for mischief through the land is: execution, or crucifixion, or the cutting off of hands and feet from opposite sides, or exile from the land: that is their disgrace in this world, and a heavy punishment is theirs in the Hereafter;" - Quran 5:33 (read more)

"Narrated Kurib: the freed slave of Ibn 'Abbas, that Maimuna bint Al-Harith told him that she manumitted a slave-girl without taking the permission of the Prophet. On the day when it was her turn to be with the Prophet, she said, "Do you know, O Allah's Apostle, that I have manumitted my slave-girl?" He said, "Have you really?" She replied in the affirmative. He said, "You would have got more reward if you had given her (i.e. the slave-girl) to one of your maternal uncles." - Sahih Bukhari 3:47:765 (read more)

"Ibn al-Qasaar and our shaykh said: the Sahaabah agreed that [the person who does homosexual acts] should be killed, but they differed as to how he should be killed. Abu Bakr al-Siddeeq said that he should be thrown down from a cliff. ‘Ali (may Allaah be pleased with him) said that a wall should be made to collapse on him. Ibn ‘Abbaas said, they should be killed by stoning. This shows that there was consensus among them that [the person who does homosexual acts] should be killed, but they differed as to how he should be executed." - Sheikh Muhammed Salih Al-Munajjid