Exodus 7:20

7:20 Moses and Aaron did so, as Yahweh commanded; and he lifted up the rod, and struck the waters that were in the river, in the sight of Pharaoh, and in the sight of his servants; and all the waters that were in the river were turned to blood.
-World English Bible

Other Translation

7:20 And Moses and Aaron did so, as the LORD commanded; and he lifted up the rod, and smote the waters that [were] in the river, in the sight of Pharaoh, and in the sight of his servants; and all the waters that [were] in the river were turned to blood.
-King James Version