2 Kings 3:20-22

20And it came to pass in the morning, when the oblation was offered up, that behold, there came water by the way of Edom, and the country was filled with water.

21And all the Moabites heard that the kings were come up to fight against them, and they were called together, all that were able to put on armour, and upward, and stood by the border.

22And they rose up early in the morning, and the sun rose upon the water, and the Moabites saw the water on the other side red as blood.