Charles Ellicott Commentary 2 Kings 3:22

"And they rose up early in the morning, and the sun shone upon the water, and the Moabites saw the water over against them as red as blood:" — 2 Kings 3:22 (ASV)

They rose up early. —The Moabite camp on the frontier mountains.

And the sun shone upon the water. —A parenthesis (now the sun had risen upon the water). The red sunrise tinged the water with the same color.

On the other side. — Min-nèged, “opposite,” “over against them” (2 Kings 2:7; 2 Kings 2:15). The sun rose behind the Moabites.

Red. —’ Adôm. There may be an allusion to the red earth of the locality (Edom), which would further redden the water.