Who JAH Bless
Jah or Yah (Hebrew: יהּ, Yah) is a short form of Yahweh, the proper name of God in the Hebrew Bible. In the King James Version there is only a single instance of JAH (capitalised), in Psalm 68:4
The song is a reminder that nothing can stop a man or woman who is moving with God. Balaam tried to curse the children of Israel but ended up blessing them. In the same manner if God is really moving with us and if we are living according to his will and purpose for our lives then nothing can stop our progress.