Isaiah 51:9-11 (NKJV)
9 Awake, awake, put on strength, O arm of the Lord! Awake as in the ancient days, In the generations of old. AreYou not the arm that cut Rahab apart, And wounded the serpent? 10 Are You not the Onewho dried up the sea, The waters of the great deep; That made the depths of the sea a road For the redeemed to cross over? 11 So the ransomed of the Lordshall return, And come to Zion with singing, With everlasting joy on their heads. They shall obtain joy and gladness; Sorrow and sighing shall flee away.
In our passage today Isaiah calls upon the Lord to fulfill His promise to rescue His people Israel from exile; indeed, not only to rescue His people Israel but to rescue all the peoples of the earth. The nations that sat in darkness needed the light of God. And so Isaiah cries out to God to fulfill His promises, “Awake, awake, put on strength, O arm of the Lord!”
Isaiah calls to the Lord’s mind His previous acts of deliverance and implores Him to act again. “Was it not You, Lord, who acted to destroy Egypt? Was it not You who dried up the Red Sea? Who made the depths of the sea a road for Israel to cross upon? Yes it was You, Lord, who did this.” So Isaiah calls upon this same Lord, the Sovereign Lord of heaven and earth, Yahweh, the Creator of all men and nations, to fulfill His promises, “Awake! Awake, put on strength, O arm of the Lord! Awake as in the ancient days, in the generations of old.”
And this, brothers and sisters, is what we pray in Advent. During Advent we recall the cries of our fathers like Isaiah and issue cries of our own. We rejoice because God answered Isaiah’s cry by sending our Lord and Savior Jesus to rescue the world from sin and darkness. But we not only rejoice that God has fulfilled Isaiah’s prayer, we also lift up prayers of our own. For the Lord has yet to fulfill all His promises. He has yet to fill the earth with the knowledge of His name, yet to spread justice to all the ends of the earth, yet to bring history to a close in the return of Christ and the resurrection of the just and unjust. And so we are instructed by our Lord Jesus to cry out, “Thy Kingdom come! Thy will be done on earth as it is in heaven!” In other words, “Awake! Awake, put on strength, O arm of the Lord! Awake as in the ancient days, in the generations of old.”
One of the chief ways that we issue this cry is in our singing – we praise the Lord who has acted and beseech Him to act yet again. Note that Isaiah’s vision of God’s redemption in Jesus is filled with singing. “So the ransomed of the Lord shall return, And come to Zion with singing.” Because God has answered Isaiah’s cry to “Awake!”, we ought to sing and praise the Lord, to come to Zion with singing. And even as Isaiah, remembering the Exodus from Egypt, remembering God’s past deliverance, petitioned the Lord to rescue Israel again, so we cry out in song for the full revelation of Christ’s kingdom.
So how ought we to sing? Isaiah models and instructs us. Note that his cry to God is filled with passion, conviction, entreaty, hunger, longing, joy, and delight. “Awake! Awake!” he cries. Then he describes our singing, So the ransomed of the Lordshall return, And come to Zion with singing, With everlasting joy on their heads. They shall obtain joy and gladness; Sorrow and sighing shall flee away. May God make it so and fill us with joy and peace in believing and in singing.

Reminded that we are yet in need of the Lord’s mercy, that the Lord has exhorted us to sing and pray for the full arrival of His Kingdom, let us confess that we are often complacent and do not cry out to the Lord to fulfill his promises.