To kill Americans and their allies, both civil and military, is an individual duty of every Muslim who can, in any country where this is possible, until the Aqsa mosque [in Jerusalem] and the Haram mosque [in Mecca] are freed from their grip, and until their armies, shattered and broken-winged, depart from all the lands of Islam, incapable of threatening any Muslim.

Declaration of jihad [February 1998]