2 Kings 3:20-22

20The next morning, at the time of the morning sacrifice, water suddenly flowed from the direction of Edom and filled the land.

21Now all the Moabites had heard that the kings had come up to fight against them. So all who could bear arms, young and old, were summoned and stationed at the border. 22When they got up early in the morning, the sun was shining on the water, and it looked as red as blood to the Moabites across the way.