וְהָיָ֣ה ׀ עַל־כָּל־הַ֣ר גָּבֹ֗הַ וְעַל֙ כָּל־גִּבְעָ֣ה נִשָּׂאָ֔ה פְּלָגִ֖ים יִבְלֵי־מָ֑יִם בְּיוֹם֙ הֶ֣רֶג רָ֔ב בִּנְפֹ֖ל מִגְדָּלִֽים׃
Y sobre todo monte alto, y sobre todo collado subido, habrá ríos y corrientes de aguas el día de la gran matanza, cuando caerán las torres.
Rashi on Isaiah
rivulets of water (יִבְלֵי מָיִם), rivers of water. Comp. (Jer. 17:8) “And upon the river (יוּבַל) he sends forth his roots.”
Ibn Ezra on Isaiah
יבלי Rivers. Comp. יובל river (Jer. 17:8). And there shall be upon every high mountain, etc. The rain will come in such quantity, that the water will remain upon the mountains.36The hills and mountains are deprived of the water which they receive from the rain in a very short time; the water partly evaporating, partly flowing down to the plains. They retain of course the more of the water, the greater its supply is.
Rashi on Isaiah
on the day of the great slaying when there will be a great slaughter (in the land of Assyria), and Jonathan renders: On the day of the great slaying, when the great ones will fall.