Discovery BoxExodus 8:5 
Context8:5 The Lord spoke to Moses, “Tell Aaron, ‘Extend your hand with your staff 1 over the rivers, over the canals, and over the ponds, and bring the frogs up over the land of Egypt.’”
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, 2 over their ponds, and over all their reservoirs 3 – so that it becomes 4 blood.’ There will be blood everywhere in 5 the land of Egypt, even in wooden and stone containers.”
1 sn After the instructions for Pharaoh (7:25-8:4), the plague now is brought on by the staff in Aaron’s hand (8:5-7). This will lead to the confrontation (vv. 8-11) and the hardening (vv. 12-15).
2 tn Or “irrigation rivers” of the Nile.
3 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.
4 tn The imperfect tense with vav (ו) after the imperative indicates the purpose or result: “in order that they [the waters] be[come] blood.”
5 tn Or “in all.”
