John Gill Commentary Isaiah 37:34

"By the way that he came, by the same shall he return, and he shall not come unto this city, saith Jehovah." — Isaiah 37:34 (ASV)

By the way that he came, by the same shall he return
Without executing his designs on Jerusalem, or other places; he shall lose his labour, and make the best of his way to his own country, without turning to the right or left, in order to disturb other nations, and enlarge his kingdom, being quite dispirited and confounded by what he shall meet with:

and shall not come into this city, saith the Lord ;
or, unto this city, as before; which is repeated to confirm it, and to show the certainty of it.