Sing unto God, sing praises to his name: extol him that rideth upon the heavens by his name JAH, and rejoice before him. Extol him that rideth upon the heavens by his name Jah - "Extol him who sitteth on the throne of glory, in the ninth heaven; Yah is his name; and rejoice before him." - Targum.
בערבות baaraboth, which we render in the high heavens, is here of doubtful signification. As it comes from the root ערב arab, to mingle, (hence ereb the evening or twilight, because it appears to be formed of an equal mixture of light and darkness; the Septuagint translate it dusmwn, the west, or setting of the sun; so does the Vulgate and others); probably it may mean the gloomy desert, through which God, in the chariot of his glory, led the Israelites. If this interpretation do not please, then let it be referred to the darkness in which God is said to dwell, through which the rays of his power and love, in the various dispensations of his power and mercy, shine forth for the comfort and instruction of mankind.
By his name Jah - יה Yah, probably a contraction of the word יהוה Yehovah; at least so the ancient Versions understood it. It is used but in a few places in the sacred writings. It might be translated The Self existent.
Psalms 68:4, 7Let us now see how Isaiah treats the subject of the return of the people from Babylon. They were to march through the wilderness with Jehovah at their head, who was to lead them, to smooth the way before them, and to supply them with water in the thirsty desert; with perpetual allusion to the exodus: -
"Come ye forth from Babylon, flee ye from the land of the Chaldeans with the voice of joy: Publish ye this, and make it heard; utter it forth even to the end of the earth; Say ye, Jehovah hath redeemed his servant Jacob: They thirsted not in the deserts, through which he made them go; Waters from the rock he caused to flow for them; Yea, he clave the rock, and forth gushed the waters." Isaiah 48:20, Isaiah 48:21.
"Remember not the former things;
And the things of ancient times regard not:"
(That is, the deliverance from Egypt):
"Behold, I make a new thing;
Even now shall it spring forth; will ye not regard it?
Yea, I will make in the wilderness a way;
In the desert streams of water."