The Harbinger is a 2012 best-selling Christian novel by Rabbi Jonathan Cahn, a Messianic Jew. It suggests that the 9/11 terrorism attack was a divine warning to the United States. Cahn ties the 9/11 attacks to a section of Isaiah 9, which describes God vowing to destroy ancient Israel for persistent disobedience towards Him and ignoring the warnings He has sent them. One such warning was a military attack on Israel which caused physical damage to the land. Verses 9 and 10 record that instead of recognizing God's warning and repenting of its sins, Israel defiantly vowed to rebuild using stronger materials and planting stronger trees.