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14 They
shall lift up [nasa'] their voice [qowl], they
shall sing [ranan] for the majesty [ga'own] of the LORD [Yahovah], they
shall cry aloud [tsahal] from the sea [yam]. KJV-Interlinear
14 They lift up their voices, they sing for joy; over the majesty of
the LORD they shout from the west. ESV
The grieving and weeping and sounds of sorrow, will be replaced with songs and sounds of joy and happiness and celebration.
To lift up the voice can mean two different things. On the one hand it can refer to the pains and sorrows of destruction and loss, and on the other hand, as it is here, it can refer to the celebration of deliverance or rescue.
And when combined with the phrase, for the majesty of the Lord, the meaning here is one of great and phenomenal celebration.
These verses in Isaiah refer to the final days of history. And if a person has been hiding and surviving for many months and even years under the tremendous strain and pressure of those dreadful days, then when it is all finally over, the relief will have to be huge, and the celebration will likewise be huge.
That is what is meant here. The singing of joy, is the direct result of Christs victory and the rescue and deliverance of all mature believers that have survived until the very end of the Tribulation.
Cry aloud from the sea, is a reference to the whole world.
Not only will a remnant in Jerusalem and Judah be delivered, but remnant in the entire world will be delivered. This indicates that many believers, gentiles, around the world in other nations, will likewise survive to the Second Advent and they too, will celebrate their rescue and deliverance.