The spring of the waters - The spring intended is probably that now called Ain-es-Sultan, which is not much more than a mile from the site of the ancient town. It is described as a large and beautiful fountain of sweet and pleasant water. The springs issuing from the eastern base of the highlands of Judah and Benjamin are to this day generally brackish.

And cast the salt in there - He cast in the salt at the place where the waters sprang out of the earth. Jarchi well observes here, "Salt is a thing which corrupts water; therefore, it is evident that this was a true miracle." What Elisha did on this occasion, getting the new cruse and throwing in the salt, was only to make the miracle more conspicuous. If the salt could have had any natural tendency to render the water salubrious, it could have acted only for a short time, and only on that portion of the stream which now arose from the spring; and in a few moments its effects must have disappeared. But the miracle here was permanent: the death of men and cattle, which had been occasioned by the insalubrity of the waters, ceased, the land was no longer barren; and the waters became permanently fit for all agricultural and domestic uses.

And he went forth unto the spring of the waters,.... The fountain from whence they flowed, the head of them:

and cast the salt in there; which was an unlikely means of making bad water good, since that makes it brackish, and not so drinkable, and what makes ground barren; but this method, contrary to nature, was taken, that the miracle might appear the greater; or, as the Jews express it, be a miracle within a miracle:

and said, thus saith the Lord, I have healed these waters; he did not pretend to heal them in his own name, and by his own power, but in the name and by the power of the Lord, to whom he would have it ascribed:

there shall not be from thence any more death, or barren land; or miscarrying; no more noxious and mortal diseases should be got by drinking them, nor any abortions occasioned by them in women, cattle, and fruit trees, as had been.

And he went forth unto the spring of the waters, and cast {m} 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.

(m) Thus God gave him power, even contrary to nature, to make the water profitable for man's use, which before was hurtful.

2:21 Death - Hurt, or danger, to man or beast, by drinking of it.

2:19-25 Observe the miracle of healing the waters. Prophets should make every place to which they come better for them, endeavouring to sweeten bitter spirits, and to make barren souls fruitful, by the word of God, which is like the salt cast into the water by Elisha. It was an apt emblem of the effect produced by the grace of God on the sinful heart of man. Whole families, towns, and cities, sometimes have a new appearance through the preaching of the gospel; wickedness and evil have been changed into fruitfulness in the works of righteousness, which are, through Christ, to the praise and glory of God. Here is a curse on the youths of Bethel, enough to destroy them; it was not a curse causeless, for it was Elisha's character, as God's prophet, that they abused. They bade him go up, reflecting on the taking up of Elijah into heaven. The prophet acted by Divine impulse. If the Holy Spirit had not directed Elisha's solemn curse, the providence of God would not have followed it with judgment. The Lord must be glorified as a righteous God who hates sin, and will reckon for it. Let young persons be afraid of speaking wicked words, for God notices what they say. Let them not mock at any for defects in mind or body; especially it is at their peril, if they scoff at any for well doing. Let parents that would have comfort in their children, train them up well, and do their utmost betimes to drive out the foolishness that is bound up in their hearts. And what will be the anguish of those parents, at the day of judgment, who witness the everlasting condemnation of their offspring, occasioned by their own bad example, carelessness, or wicked teaching!