2 Kings 3:20-22

20Now it happened in the morning, when the grain offering was offered, that suddenly water came by way of Edom, and the land was filled with water.

21And when all the Moabites heard that the kings had come up to fight against them, all who were able to bear arms and older were gathered; and they stood at the border.

22Then they rose up early in the morning, and the sun was shining on the water; and the Moabites saw the water on the other side as red as blood.