2 Kings 3:20-22

20The next morning, about the time for offering the sacrifice, there it was—water flowing from the direction of Edom! And the land was filled with water.

21Now all the Moabites had heard that the kings had come to fight against them; so every man, young and old, who could bear arms was called up and stationed on the border.

22When they got up early in the morning, the sun was shining on the water. To the Moabites across the way, the water looked red—like blood.