Ibn Ezra on Isaiah
Isaiah 37
2. In the book of Kings (19:14) ויקראם And he read them, viz., the documents (הספרים); in Isaiah (37:14) ויקראהו And he read it, viz., that document alone, which contained the blasphemies; in both, And spread it.
3. In the book of Kings there is the addition of the words נהרי זרים=זרים, the rivers of strangers, after מים water.
4. In the book of Kings (19:25) להשות וגו׳ To make equal, etc., to make fenced cities equal to heaps of ruins; in the book of Isaiah (37:26) להשאות to lay waste, etc., to lay waste fenced cities, that they be like heaps of ruins; comp. שואה desolation (10:3); or להשאות is the same as להשות, since א and ו frequently interchange.
5. In the book of Kings (19:26) שרפה; in Isaiah (37:27) שדמה; though there be two different words, their meaning is the same, blasted.
6. In the book of Kings (19:29) סחיש; in Isaiah (37:30) שחים; these two words are the same in meaning—that which springeth of the same. Comp. כבש and כשב lamb (Lev. 3:7, and 4:32)
You arrive at the cited line; the whole work is yours to read around it. The text is set from the cited public-domain edition.