Isaiah 12:2. “Behold, God is my salvation; I will trust, and not be afraid: for the Lord Jehovah is my strength and my song: He also is become my salvation.”
The only other place in which the construct LORD JEHOVAH is used is in Isaiah 26:4. This double title establishes Him as LORD GOD; it is the Lord most vehement. It is the supreme Lord. Nothing nor nor one is above Him. His power is absolute.
After the Jews who come through the seven years of the Great Tribulation have endured and turned completely back to the LORD GOD, they finally, with the rest of the world, find that He alone is salvation; He alone is strength; and He alone is the song, or the joy, the worship, the praise.