“This is a difficult verse to interpret because of its elliptical style and the alternation of number. In the first and last cola the subject is singular; in the second colon is it plural. When this variation is coupled with the paucity of words, many commentators despair and with Odeberg call it a collection of glosses. But that is hardly a solution, becuase glosses are for the purpsoe of clarifying, and it is hard to imagine persons who felt free to add something to the prophetic text not taking the care to help rather than hinder.”
John Oswalt on Isaiah 57:2
Emphasis mine
