"And Mary the daughter of 'Imran, who guarded her chastity; and We breathed into (her body) of Our spirit; and she testified to the truth of the words of her Lord and of His Revelations, and was one of the devout (servants)." - Quran 66:12 (read more)

"Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: The last hour would not come unless the Muslims will fight against the Jews and the Muslims would kill them until the Jews would hide themselves behind a stone or a tree and a stone or a tree would say: Muslim, or the servant of Allah, there is a Jew behind me; come and kill him; but the tree Gharqad would not say, for it is the tree of the Jews." - Sahih Muslim 41:6985 (read more)

"The actual example of one of the greatest Companions, `Ali ibn Abi Talib (may Allah be pleased with him) gives credit to this [death sentence for apostasy] also. He himself carried out the punishment on some people who had deified him. He gave them three days respite to repent and go back to their senses. When they proved adamant, he put them to fire." - IslamOnline