These witnesses have power to shut the sky so that no rain will fall during the days of their prophecy, and power to turn the waters into blood and to strike the earth with every kind of plague as often as they wish.

Exodus 7:17
This is what the LORD says: By this you will know that I am the LORD. Behold, with the staff in my hand I will strike the water of the Nile, and it will turn to blood.

1 Samuel 4:8
Woe to us! Who will deliver us from the hand of these mighty gods? These are the gods who struck the Egyptians with all kinds of plagues in the wilderness.

1 Kings 17:1
Now Elijah the Tishbite, who was among the settlers of Gilead, said to Ahab, "As surely as the LORD lives--the God of Israel before whom I stand--there will be neither dew nor rain in these years except at my word!"

Luke 4:25
But I tell you truthfully that there were many widows in Israel in the time of Elijah, when the sky was shut for three and a half years and great famine swept over all the land.

Revelation 8:8
Then the second angel sounded his trumpet, and something like a great mountain burning with fire was thrown into the sea. A third of the sea turned to blood,

Revelation 11:3
And I will empower my two witnesses, and they will prophesy for 1,260 days, clothed in sackcloth."

Revelation 16:3
And the second angel poured out his bowl into the sea, and it turned to blood like that of the dead, and every living thing in the sea died.

Revelation 16:4
And the third angel poured out his bowl into the rivers and springs of water, and they turned to blood.

These have power to shut heaven, that it rain not in the days of their prophecy: and have power over waters to turn them to blood, and to smite the earth with all plagues, as often as they will.