וַיַּשְׁכִּ֣ימוּ בַבֹּ֔קֶר וְהַשֶּׁ֖מֶשׁ זָרְחָ֣ה עַל־הַמָּ֑יִם וַיִּרְא֨וּ מוֹאָ֥ב מִנֶּ֛גֶד אֶת־הַמַּ֖יִם אֲדֻמִּ֥ים כַּדָּֽם׃
아침에 모압 사람이 일찍이 일어나서 해가 물에 비취므로 맞은편 물이 붉어 피와 같음을 보고
Rashi on II Kings
Red as blood. Such is the nature of water; when the sun shines on it in the morning, causes it to appear red.
Rashi on II Kings
From a distance. At a distance, but because they had never seen water in that valley, they, therefore, thought that it was blood.