Exodus 7:20

7:20 Moses and Aaron did so, just as the Lord had commanded. Moses raised the staff and struck the water that was in the Nile right before the eyes of Pharaoh and his servants, and all the water that was in the Nile was turned to blood.

Exodus 9:29

9:29 Moses said to him, “When I leave the city I will spread my hands to the Lord, the thunder will cease, and there will be no more hail, so that you may know that the earth belongs to the Lord.