2 Kings 3:20-22

20Then it came to pass in the morning, about the time of offering up the sacrifice, behold—water was flowing from the direction of Edom—so that the water covered the land.

21Meanwhile the Moabites heard that the kings had marched to fight against them. So they gathered themselves together, all that were able to put on armor and older, and stood at the border.

22When they rose up early in the morning and the sun was shining upon the water, the Moabites saw the water from a distance as red as blood!