By the rivers of Babylon, there we sat down, we also wept, when we remembered Zion. We hung our lyres on the willows in its midst. For there, those who carried us away captive required of us a song; and those who tormented us required of us mirth, saying, ‘Sing us one of the songs of Zion.’ How shall we sing God’s song in a foreign land? If I forget you, O Jerusalem, let my right hand forget her cunning. If I do not remember you, let my tongue cleave to the roof of my mouth; if I do not set Jerusalem above my highest joy. (Psalms 137:1-6)
Zion was south eastern Yemen like I mentioned earlier. Climate change made that part of Yemen arid and dusty so they moved away, diaspora like.