The prophecy recorded in perek 17 was most likely delivered following the alliance established between Aram and Israel during the reign ,of Pekach ben Remalyahu (refer back to perek 7). In this prophecy Yeshayahu describes the complete destruction of Damascus, the capital city of Aram, along with the destruction of the Northern Kingdom. The perek ends on a slightly more positive note (pesukim 12-14): Yeshayahu prophesies the collaboration of the gentile nations for war and their miraculous defeat by God as restitution for their cruel treatment of Israel.
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Courtesy of Matan Al HaPerek, Directed by Dr. Navah Cohen