2 Kings 3:21 in the King James Version
And when all the Moabites heard that the kings were come up to fight against them, they gathered all that were able to put on armour, and upward, and stood in the border.
Context
20 In the morning, about the time of offering the sacrifice, behold, water came by the way of Edom, and the country was filled with water.
21 Now when all the Moabites heard that the kings had come up to fight against them, they gathered themselves together, all who were able to put on armor, young and old, and stood on the border.
22 They rose up early in the morning, and the sun shone on the water, and the Moabites saw the water opposite them as red as blood.