God Himself, but simply to protect their own honour, that Moses and Aaron might not be thought to be superior to them in virtue or knowledge. It was equivalent to saying, it is not by Moses and Aaron that we are restrained, but by a divine power, which is greater than either” (Bochart). The word Elohim is decisive in support of this view. If they had meant to refer to the God of Israel, they would have used the name Jehovah. The “finger of God” denotes creative omnipotence (Psa 8:3; Luk 11:20, cf. Exo 31:18). Consequently this miracle also made no impression upon Pharaoh.
As the Egyptian magicians saw nothing more than the finger of God in the miracle which they could not imitate, that is to say, the work of some deity, possibly one of the gods of the Egyptians, and not the hand of Jehovah the God of the Hebrews, who had demanded the release of Israel, a distinction was made in the plagues which followed between the Israelites and the Egyptians, and the former were exempted from the plagues: a fact which was sufficient to prove to any one that they came from the God of Israel. To make this the more obvious, the fourth and fifth plagues were merely announced by Moses to the king. They were not brought on through the mediation of either himself or Aaron, but were sent by Jehovah at the appointed time; no doubt for the simple purpose of precluding the king and his wise men from the excuse which unbelief might still suggest, viz., that they were produced by the powerful incantations of Moses and Aaron.
verses 20-22
The fourth plague, the coming of which Moses foretold to Pharaoh, like the first, in the morning, and by the water (on the bank of the Nile), consisted in the sending of “heavy vermin,” probably Dog-Flies. ערב, literally a mixture, is rendered κυνόμυια (dog-fly) by the lxx, πάμμυια (all-fly), a mixture of all kinds of flies, by Symmachus. These insects are described by Philo and many travellers as a very severe scourge (vid., Hengstenberg ut sup. p. 113). They are much more numerous and annoying than the gnats; and when enraged, they fasten themselves upon the human body, especially upon the edges of the eyelids, and become a dreadful plague. כּבד:
