But if they do not believe even these two signs or listen to your voice, take some water from the Nile and pour it on the dry ground. Then the water you take from the Nile will become blood on the ground.”
It was a very great honour that Moses was called to when God commissioned him to bring Israel out of Egypt; yet he is with difficulty persuaded to accept the commission, and does it at last with great reluctance, which we should rather impute to a humble diffidence of himself and his own sufficiency than to any unbelieving distrust of God and his word and power.
Commenting on Exodus 4:1-9
And it shall come to pass, if they will not believe also these two signs,.... Performed before their eyes; for these were done over again when Moses came into Egypt to the Israelites, and yet some of them might still remain unbelievers to his commission, and so to the voice of these signs, which loudly called for their faith: neither hearken unto thy voice; affirming...
take of the water of the river--Nile. Those miracles, two of which were wrought then, and the third to be performed on his arrival in Goshen, were at first designed to encourage him as satisfactory proofs of his divine mission, and to be repeated for the special confirmation of his embassy before the Israelites.