O Lord God, thou hast begun to show thy servant thy greatness and thy mighty hand,.... To give a specimen of the greatness of his power in subduing the two kings and their kingdoms, and delivering them up into the hands of the Israelites.
Moses had seen instances of the mighty power of God in Egypt, at the Red sea, and in the wilderness; but this was the beginning of his power, in vanquishing the Canaanites, and putting their land into the possession of the Israelites, as he had promised; of which the Amorites were a part, and a principal nation of them: and thus God, when he begins a work of grace upon the soul of man, begins to show the exceeding greatness of his power, and which is further exerted in carrying it on, and bringing it to perfection:for what God is there in heaven or in earth that can do according to thy works, and according to thy might?