The burden of Damascus - The oracle indicating calamity or destruction to Damascus (see the note at Isaiah 13:1). “Damascus is taken away.” That is, it shall be destroyed. It was represented to the prophet in vision as destroyed (see the note at Isaiah 1:1).
And it shall be a ruinous heap - See Isaiah 35:2. This took place under the kings of Assyria, and particularly under Tiglath-pileser. This was in the fourth year of Ahaz 2 Kings 16:9.