for the execution of this calling. In this sense God says, in Exo 4:8, “If they will not hearken to the voice of the first sign, they will believe the voice of the latter sign.” A voice is ascribed to the sign, as being a clear witness to the divine mission of the person performing it. (Psa 105:27).
Verse 9
The Third Sign. - If the first two signs should not be sufficient to lead the people to believe in the divine mission of Moses, he was to give them one more practical demonstration of the power which he had received to overcome the might and gods of Egypt. He was to take of the water of the Nile (the river, Gen 41:1) and pour it upon the dry land, and it would become blood (the second והיוּ is a resumption of the first, cf. Exo 12:41). The Nile received divine honours as the source of every good and all prosperity in the natural life of Egypt, and was even identified with Osiris (cf. Hengstenberg, Egypt and the Books of Moses, p. 109 transl.). If Moses therefore had power to turn the life-distributing water of the Nile into blood, he must also have received power to destroy Pharaoh and his gods. Israel was to learn this from the sign, whilst Pharaoh and the Egyptians were afterwards to experience this might of Jehovah in the form of punishment (Exo 7:15.). Thus Moses as not only entrusted with the word of God, but also endowed with the power of God; and as he was the first God-sent prophet, so was he also the first worker of miracles, and in this capacity a type of the Apostle of our profession (Heb 3:1), even the God-man, Christ Jesus.
Moses raised another difficulty. “I am not a man of words,” he said (i.e., I do not possess the gift of speech), “but am heavy in mouth and heavy in tongue” (i.e., I find a difficulty in the use of mouth and tongue, not exactly “stammering”); and that “both of yesterday and the day before” (i.e., from the very first, Gen 31:2), “and also since Thy speaking to Thy servant.” Moses meant to say, “I neither possess the gift of speech by nature, nor have I received it since Thou hast spoken to me.”
verses 11-12
Jehovah both could and would provide for this defect. He had made man's mouth, and He made dumb or deaf, seeing or blind. He possessed unlimited power over all the senses, could give them or take them away; and He would be with Moses' mouth, and teach him what he was to say, i.e.,
