Adam Clarke on Isaiah 57:21

There is no peace, saith my God - For אלהי Elohai, twenty-two MSS. (five ancient) of Kennicott's, thirty of De Rossi's, and one ancient of my own, read יהוה Yehovah; the Vulgate, Septuagint, Alex., and Arabic, and three MSS. have both. This verse has reference to the nineteenth. The perseveringly wicked and impenitent are excluded from all share in that peace above mentioned, that reconcilement and pardon which is promised to the penitent only. The forty-eighth chapter ends with the same declaration, to express the exclusion of the unbelievers and impenitent from the benefit of the foregoing promises. - L.