Discovery BoxExodus 8:5-6 
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.’” 8:6 So Aaron extended his hand over the waters of Egypt, and frogs 2 came up and covered the land of Egypt.
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 The noun is singular, a collective. B. Jacob notes that this would be the more natural way to refer to the frogs (Exodus, 260).
