וַיַּשְׁכִּ֣ימוּ בַבֹּ֔קֶר וְהַשֶּׁ֖מֶשׁ זָרְחָ֣ה עַל־הַמָּ֑יִם וַיִּרְא֨וּ מוֹאָ֥ב מִנֶּ֛גֶד אֶת־הַמַּ֖יִם אֲדֻמִּ֥ים כַּדָּֽם׃
清早他們起來，太陽照在水面上，摩押人從遠處看見那水紅得像血一樣。
Rashi
Red as blood. Such is the nature of water; when the sun shines on it in the morning, causes it to appear red.
Rashi
From a distance. At a distance, but because they had never seen water in that valley, they, therefore, thought that it was blood.