The (officially titled Index des citations et allusions bibliques dans la littérature patristique ) is a monumental academic tool designed to map the use of the Bible in the writings of the Early Church Fathers. Prepared by the Center for Analysis and Patristic Documentation (CADP) at the CNRS in Strasbourg, it lists biblical citations across several volumes, covering authors from the origins of Christian literature up to the late 4th century. Where to Find It for Free