Discovery BoxExodus 4:9 
Context4:9 And if 1 they do not believe even these two signs or listen to you, 2 then take 3 some water from the Nile and pour it out on the dry ground. The water you take out of the Nile will become blood on the dry ground.” 4
Exodus 7:19
Context7:19 Then the Lord said to Moses, “Tell Aaron, ‘Take your staff and stretch out your hand over Egypt’s waters – over their rivers, over their canals, 5 over their ponds, and over all their reservoirs 6 – so that it becomes 7 blood.’ There will be blood everywhere in 8 the land of Egypt, even in wooden and stone containers.”
Exodus 8:21
Context8:21 If you do not release 9 my people, then I am going to send 10 swarms of flies 11 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. 12
1 tn Heb “and it will be if.”
2 tn Heb “listen to your voice.”
3 tn The verb form is the perfect tense with the vav (ו) consecutive; it functions then as the equivalent of the imperfect tense – here as an imperfect of instruction.
4 sn This is a powerful sign, for the Nile was always known as the source of life in Egypt, but now it will become the evidence of death. So the three signs were alike, each consisting of life and death. They would clearly anticipate the struggle with Egypt through the plagues. The point is clear that in the face of the possibility that people might not believe, the servants of God must offer clear proof of the power of God as they deliver the message of God. The rest is up to God.
5 tn Or “irrigation rivers” of the Nile.
6 sn The Hebrew term means “gathering,” i.e., wherever they gathered or collected waters, notably cisterns and reservoirs. This would naturally lead to the inclusion of both wooden and stone vessels – down to the smallest gatherings.
7 tn The imperfect tense with vav (ו) after the imperative indicates the purpose or result: “in order that they [the waters] be[come] blood.”
8 tn Or “in all.”
9 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.”
10 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”).
11 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.
12 tn Or perhaps “the land where they are” (cf. NRSV “the land where they live”).
