Jamieson, Fausset and Brown on 2 Kings 5:18

18. goeth into the house of Rimmon--a Syrian deity; probably the sun, or the planetary system, of which a pomegranate (Hebrew, Rimmon) was the symbol.

leaneth on my hand--that is, meaning the service which Naaman rendered as the attendant of his sovereign. Elisha's prophetic commission not extending to any but the conversion of Israel from idolatry, he makes no remark, either approving or disapproving, on the declared course of Naaman, but simply gives the parting benediction (2Ki 5:19).

2Ki 5:20-27. Gehazi, by a Lie, Obtains a Present, but Is Smitten with Leprosy.