Exodus 7:20

“But if it will be that they will not believe even these two signs and that they will not listen to your voice, then you shall take some water from the Nile and pour it on the dry land; and the water which you take from the Nile will become blood on the dry land.”

“And you shall take in your hand this staff, with which you shall do the signs.”

‘Thus says Yahweh, “By this you shall know that I am Yahweh: behold, I am about to strike the water that is in the Nile with the staff that is in my hand, and it will be turned to blood.

Then Yahweh said to Moses, “Pass before the people and take with you some of the elders of Israel; and take in your hand your staff with which you struck the Nile, and go.

and His signs and His works which He did in the midst of Egypt to Pharaoh the king of Egypt and to all his land;

Then he said to Gehazi, “Gird up your loins and take my staff in your hand, and go; if you meet anyone, do not greet him, and if anyone greets you, do not answer him; and lay my staff on the boy’s face.”

“Then You performed signs and wonders against Pharaoh, Against all his servants and all the people of his land; For You knew that they acted presumptuously toward them, And made a name for Yourself as it is this day.

And turned their rivers to blood, And their streams, they could not drink.

He turned their waters into blood And caused their fish to die.

Did Yahweh’s fury burn against the rivers, Or was Your anger against the rivers, Or was Your wrath against the sea, That You rode on Your horses, On Your chariots of salvation?

And the second angel sounded, and something like a great mountain burning with fire was thrown into the sea; and a third of the sea became blood,

These have the authority to shut up the sky, so that rain will not fall during the days of their prophesying; they also have authority over the waters to turn them into blood, and to strike the earth with every plague, as often as they wish.

And the second angel poured out his bowl into the sea, and it became blood like that of a dead man, and every living thing in the sea died.

Then the third angel poured out his bowl into the rivers and the springs of waters, and they became blood.