For the LORD shall rise up as in mount Perazim, he shall be wroth as in the valley of Gibeon, that he may do his work, his strange work; and bring to pass his act, his strange act. As in Mount Perazim - כהר kehar; but בהר bahar, In the mount, is the reading of two of Kennicott's, one of De Rossi's, and one of my own MSS.
Related Commentaries of Isaiah 28:21
Isaiah 28:21
21 For the LORD shall rise up as in mount Perazim, he shall be wroth as in the valley of Gibeon, that he may do his work, his strange work; and bring to pass his act, his strange act.