Discovery BoxExodus 8:21 
Context8:21 If you do not release 1 my people, then I am going to send 2 swarms of flies 3 on you and on your servants and on your people and in your houses. The houses of the Egyptians will be full of flies, and even the ground they stand on. 4
Exodus 18:14
Context18:14 When Moses’ father-in-law saw all that he was doing for the people, he said, “What is this 5 that you are doing for the people? 6 Why are you sitting by yourself, and all the people stand around you from morning until evening?”
1 tn The construction uses the predicator of nonexistence – אֵין (’en, “there is not”) – with a pronominal suffix prior to the Piel participle. The suffix becomes the subject of the clause. Heb “but if there is not you releasing.”
2 tn Here again is the futur instans use of the participle, now Qal with the meaning “send”: הִנְנִי מַשְׁלִיחַ (hinni mashliakh, “here I am sending”).
3 tn The word עָרֹב (’arov) means “a mix” or “swarm.” It seems that some irritating kind of flying insect is involved. Ps 78:45 says that the Egyptians were eaten or devoured by them. Various suggestions have been made over the years: (1) it could refer to beasts or reptiles; (2) the Greek took it as the dog-fly, a vicious blood-sucking gadfly, more common in the spring than in the fall; (3) the ordinary house fly, which is a symbol of Egypt in Isa 7:18 (Hebrew זְבוּב, zÿvuv); and (4) the beetle, which gnaws and bites plants, animals, and materials. The fly probably fits the details of this passage best; the plague would have greatly intensified a problem with flies that already existed.
4 tn Or perhaps “the land where they are” (cf. NRSV “the land where they live”).
5 tn Heb “what is this thing.”
6 sn This question, “what are you doing for the people,” is qualified by the next question. Sitting alone all day and the people standing around all day showed that Moses was exhibiting too much care for the people – he could not do this.
