Isaiah 41:17

When the poor and needy seek water -Water is often used in the Scriptures as an emblem of the provisions of divine mercy. Bursting fountains in a desert, and flowing streams unexpectedly met with in a dry and thirsty land, are often also employed to denote the comfort and refreshment which the gospel furnishes to sinful and suffering man in his journey through this world. The ‘poor and needy’ here, doubtless refer primarily to the afflicted captives in Babylon. But the expression of the prophet is general, and the description is as applicable to his people at all times in similar circumstances as it was to them. The image here is derived from their anticipated return from Babylon to Judea.