2 Kings 3:20-22

20Sure enough, the next morning, at the time of the morning sacrifice, water came flowing down from Edom and filled the land.

21Now all Moab had heard that the kings were attacking, so everyone old enough to fight was mustered and placed at the border.

22When they got up early the next morning, the sun was shining on the water. To the Moabites, who were some distance away, the water looked red like blood.