John Gills Exposition of the Bible Commentary - Psalms 137:8
O daughter of Babylon, who art to be destroyed ,.... By the determinate counsel and decree of God, and according to divine predictions; see Jeremiah 50:1 ; so mystical Babylon, antichrist, and the man of sin, who therefore is called the son of perdition, 2 Thessalonians 2:3 ; because appointed to destruction, and shall certainly go into it, Revelation 17:8 ; or "O thou destroyer", as the Targum, which paraphrases it thus, "Gabriel, the prince of Zion, said to the Babylonish nation... read more
Matthew Henry's Complete Commentary - Psalms 137:7-9
The pious Jews in Babylon, having afflicted themselves with the thoughts of the ruins of Jerusalem, here please themselves with the prospect of the ruin of her impenitent implacable enemies; but this not from a spirit of revenge, but from a holy zeal for the glory of God and the honour of his kingdom. I. The Edomites will certainly be reckoned with, and all others that were accessaries to the destruction of Jerusalem, that were aiding and abetting, that helped forward the affliction (Zech.... read more