Then Rezin king of Syria and Pekah son of Remaliah king of Israel came up to Jerusalem to war: and they besieged Ahaz, but could not overcome him.
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George Leo Haydock
Then. In punishment of such enormous crimes, God first delivered Achaz into the hands of Rasin, (2 Paralipomenon xxviii.; St. Jerome, in Isaias vii.) and afterwards Phacee destroyed 120,000 in one battle, and took 200,000 prisoners, whom the prophet Oded persuaded him to release, 2 Paralipomenon xxviii. 8, 11. Salien (the year before Christ 759.) observes that the two kings then joined their forces, and besieged Jerusalem the following year, but to no purpose. (Haydock)
Isaias was sent before the siege to encourage Achaz, and to promise the miraculous birth of the Messias, as a sign that he should be delivered: and to convince him of it the more, he foretold that the two kings should be destroyed before his own son should be able to say father, Isaias vii. 8. Yet as Achaz did not still amend his life, God sent the same kings the following year (the year of the world 3263.) to lay waste the country. (Calmet)