Psalm 137, verses 1 through 4, from the Authorized Version:

1 By the rivers of Babylon, there we sat down, yea, we wept, when we remembered Zion. 2 We hanged our harps upon the willows in the midst thereof. 3 For there they that carried us away captive required of us a song; and they that wasted us required of us mirth, saying, Sing us one of the songs of Zion. 4 How shall we sing the LORD's song in a strange land?

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Alex