Adam Clarke on Isaiah 63:1

Who is this that cometh from Edom - Probably both Edom and Bozrah are only figurative expressions, to point out the place in which God should discomfit his enemies. Edom signifies red, and Bozrah, a vintage. Kimchi interprets the whole of the destruction of Rome.

I that speak in righteousness "I who publish righteousness" - A MS. has המדבר hammedabber, with the demonstrative article added with greater force and emphasis: The announcer of righteousness. A MS. has צדקה tsedakah, without ב be prefixed; and so the Septuagint and Vulgate. And thirty-eight MSS. (seven ancient) of Dr. Kennicott's, and many of De Rossi's, and one of my own, add the conjunction ו vau to רב rab, and mighty; which the Septuagint, Syriac, and Vulgate confirm. - L.