2 Kings 2

12. Elisha saw it, and he cried, My father--that is, spiritual father, as the pupils of the prophets are called their sons.
the chariot of Israel, and the horseman thereof--that is, that as earthly kingdoms are dependent for their defense and glory upon warlike preparations, there a single prophet had done more for the preservation and prosperity of Israel than all her chariots and horsemen.
took hold of his own clothes and rent them--in token of his grief for his loss.

13. He took up also the mantle of Elijah--The transference of this prophetic cloak was, to himself, a pledge of his being appointed successor, and it was an outward token to others of the spirit of Elijah resting upon him.

14-18. smote the waters--The waving of the mantle on the river, and the miraculous division of the waters consequent upon it, was an evidence that the Lord God of Elijah was with him, and as this miracle was witnessed by the scholars of the prophets from Jericho, they forthwith recognized the pre-eminence of Elisha, as now the prophet of Israel.

16-18. fifty strong men, let them go, we pray thee, and seek thy master--Though the young prophets from Jericho had seen Elijah's miraculous passage of the Jordan, they had not witnessed the ascension. They imagined that he might have been cast by the whirlwind on some mountain or valley; or, if he had actually been admitted into heaven, they expected that his body would still be remaining somewhere on earth. In compliance with their importunity, he gave them permission, but told them what the result would be.

2 Kings 2:19-25 . ELISHA HEALS THE WATERS.

20. Bring me a new cruse, and put salt therein--The noxious qualities of the water could not be corrected by the infusion of salt--for, supposing the salt was possessed of such a property, a whole spring could not be purified by a dishful for a day, much less in all future time. The pouring in of the salt was a symbolic act with which Elisha accompanied the word of the Lord, by which the spring was healed [KEIL].

23, 24. there came forth little children out of the city--that is, the idolatrous, or infidel young men of the place, who affecting to disbelieve the report of his master's translation, sarcastically urged him to follow in the glorious career.
bald head--an epithet of contempt in the East, applied to a person even with a bushy head of hair. The appalling judgment that befell them was God's interference to uphold his newly invested prophet.