2 Kings 2:20 - Joseph Benson’s Commentary on the Old and New Testaments

And he said, Bring me a new cruise He says new, partly that there might be no ground of suspicion that the cure was wrought by the natural virtue of any thing which was or had been in the cruise before, but only by God's power; and partly that there might be no legal pollution in it which might offend God, and hinder his miraculous operation by it. And put salt therein A most improper remedy; for salt naturally makes waters brackish, and lands barren, Hereby therefore he intended to show, that the change desired was to be effected, not by any natural means, but solely by the divine power, which could work either without means or against them. Thus Christ anointed the eyes of a blind man with clay, when he was going to restore him to sight, that he might show that no natural cause was concerned in his cure; clay, according to its natural effect, being more likely to injure his eyes than benefit them.