Jonathan David Cahn is a Messianic Jewish Rabbi and pastor. Messianic Judaism is a movement that combines Christianity—most importantly, the Christian belief that Jesus is the Messiah— with elements of Judaism and Jewish culture. Cahn is best known for his best selling novel The Harbinger, in which he compares the United States and the September 11, 2001 attacks to ancient Israel and the destruction of the Kingdom of Israel. In particular, he sees Isaiah 9:10 as a prophetic warning to the United States. Cahn's prophies aren't reliable.