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This portion of the Isaianic corpus concludes with a divine invitation. It is an invitation of grace, to receive lifegiving water free of charge. It recalls Yahweh’s earlier provision of manna and water in the desert and foreshadows the One who said, “If anyone is thirsty, let him come to me and drink” (Jn 7:37).
Vv.6-7 are a final appeal to the exiles to seek Yahweh and return to him. Vv.8-9 remind the people that their deliverance is beyond human comprehension. God’s word has promised it. It will not return void. We recall the opening verses of this portion of the book of Isaiah, “The word of our God stands forever” (40:8).
The prophet concludes this section by announcing and celebrating the departure from exile. Again, this act of deliverance will cause all creation to join in the celebration, and restored Israel will stand as an everlasting sign to all the nations that Yahweh is faithful to his covenant.