John Calvin 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 shall he return. We have previously explained what it is to return by the same way, that is, to depart without having accomplished anything, as we commonly say (Il s’en est retourné 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 has the Lord spoken;” for as soon as He who cannot lie (Titus 1:2) has spoken, we ought to embrace and kiss His word, as if the result were rendered certain by the removal of every obstruction.