By the way that he came shall he return. We have formerly explained what it is to return by the same way, that is, to depar without having accomplished anything, as we commonly say, (Il s'en est retourne comme il est venu,) "he returned as he came," when nothing has been accomplished, and the efforts are unsuccessful. To confirm this, he adds, that "thus hath the Lord spoken;" for as soon as he "who cannot lie" (Titus 1:2) hath spoken, we ought to embrace and kiss his word, as if the result were rendered certain by the removal of every obstruction.

By the way that he came - (Isaiah 37:29; compare Isaiah 37:37).
And shall not come into this city - (Isaiah 37:33; compare Isaiah 29:6-8).

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.

(See Isaiah 37:29, Isaiah 37:37; Isaiah 29:5-8).