Is there any number of his armies? - The armies of heaven; or the hosts of angelic beings, which are often represented as arranged or marshalled into armies; see the notes at Isaiah 1:9. The word which is used here is not the common one which is rendered “hosts,” (צבא tsâbâ'), but is גדוּד gedûd which means properly a troop, band, or army. It may here mean either the constellations often represented as the army which God marshals and commands, or it may mean the angels.
And upon whom doth not his light arise? - This is designed evidently to show the majesty and glory of God. It refers probably to the light of the sun, as the light which he creates and commands. The idea is, that it pervades all things; that, as controlled by him, it penetrates all places, and flows over all worlds. The image is a striking and sublime one, and nothing is better fitted to show the majesty and glory of God.