Psalms 137:4
How can we sing a song of the LORD
What it says
They ask how the LORD's song could be sung in a foreign land.
What it is doing
This verse states the central impossibility that governs the opening lament.
In context
1By the rivers of Babylon we sat and wept 2There on the willows 3for there our captors requested a song; 4How can we sing a song of the LORD 5If I forget you, O Jerusalem, 6May my tongue cling to the roof of my mouth 7Remember, O LORD, 8O Daughter of Babylon, 9Blessed is he who seizes your infants