Jamieson, Fausset and Brown on Isaiah 37:26

26. Reply of God to Sennacherib.

long ago--join, rather, with "I have done it." Thou dost boast that it is all by thy counsel and might: but it is I who, long ago, have ordered it so (Is 22:11); thou wert but the instrument in My hands (Is 10:5, 15). This was the reason why "the inhabitants were of small power before thee" (Is 37:27), namely, that I ordered it so; yet thou art in My hands, and I know thy ways (Is 37:28), and I will check thee (Is 37:29). Connect also, "I from ancient times have arranged ('formed') it." However, English Version is supported by Is 33:13; 45:6, 21; 48:5.