This verse may be translated literally as follows:
Behold El is my salvation,
I shall trust and not be afraid;
For my strength and my song is Yah, Yehovah,
And he has become my salvation.
As Jesus himself would later testify, he was the great Jehovah, the Law and the Light, who came to earth to provide eternal life (3 Nephi 15:5–9). He literally became salvation, as Isaiah prophesied.
El is the singular of Elohim, but the word seldom occurs in the Bible in singular form. In the King James Version of the Bible, both singular and plural are rendered by the word God.Yah is a contracted form of Jehovah or Yehovah, which in the Bible is usually rendered in English as Lord. Here, to avoid Lord Lord, the translators rendered it Lord Jehovah. This is one of the few times the name is written out fully as Jehovah in the King James Version. The short form Yah also occurs in Hebrew in Exodus 15:2 and Psalm 118:14, which passages reflect a similar tone of praise.
Moses, a type of the Messiah, was a great lawgiver and a great deliverer; the Messiah himself was the great Lawgiver and the great Deliverer. The Messiah is Jehovah, and Jehovah is our strength and our song; he is our salvation. It was Jesus Christ who gave his life for our salvation. Jehovah, therefore, could be none other than Jesus Christ, our Lord.