Albert Barnes Commentary 2 Kings 5:20

"But Gehazi the servant of Elisha the man of God, said, Behold, my master hath spared this Naaman the Syrian, in not receiving at his hands that which he brought: as Jehovah liveth, I will run after him, and take somewhat of him." — 2 Kings 5:20 (ASV)

This Syrian - The words are emphatic. Gehazi convinces himself that it is right to take something from a Syrian—that is, a Gentile and an enemy of Israel.

As the Lord lives - This phrase is used here as a profane oath. Anxious to convince himself that he was acting in a proper and even religious spirit, Gehazi did not hesitate to use one of the most solemn of religious phrases.