Cast the salt in there; which was in itself idle and ineffectual, considering both the quality of salt, and the small quantity of it, and the place where it was put, the fountain, which quickly works out any thing which is put into it; see Leviticus 11:36; but was only used as a sign of God's presence and power, which did the thing: compare Exodus 15:25 2 Kings 4:41, 2 Kings 6:6. Any more death, i.e. hurt or danger, as death is oft used, \as 2 Corinthians 11:23\ to men or beasts, by drinking of it, as formerly.
Related Commentaries of 2 Kings 2:21
2 Kings 2:21
21 And he went forth unto the spring of the waters, and cast the salt in there, and said, Thus saith the LORD, I have healed these waters; there shall not be from thence any more death or barren land.