The Harbinger is a 2011[1] Christian novel by Jonathan Cahn, a Messianic Jew,[2] in which the 9/11 terrorism attack is presented as "divine warning" to the United States.

[3][4] The author says that The Harbinger is a loosely fictional novel, rooted in biblical analysis regarding a real-life, non-fiction connection: a prophecy about ancient Israel that was eventually fulfilled in the eighth century BC when Israel was destroyed, and certain corresponding events and facts related to the 9/11 terror attacks against the U.S. in 2001 that show parallels to those events.

The author lists a series of warnings or harbingers that were given to ancient Israel before its final destruction by the Assyrians and makes a parallel between each and the events of 9/11.

A summary of Harbingers mentioned in the book follows:[3] American television and radio host Glenn Beck called it "an incredible story", saying that the author's use of novel format was at present the only way to have a serious conversation about God for modern Americans.

[14] American radio host and Denver, Colorado Pastor Bob Enyart interviewed Jonathan Cahn about his book, The Harbinger.