Musnad Abu Ya'la al-Mawsili 150:172

Abu Ma'mar Isma'il ibn Ibrahim narrated to us, Abu al-Ahwas narrated to us, from Abu Ishaq, from 'Amr ibn Ghalib, from 'A'ishah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The blood of a Muslim man is not lawful except for one of three: a life for a life, the married adulterer, and the one who abandons his religion."