Albert Barnes Commentary 2 Kings 5:18

"In this thing Jehovah pardon thy servant: when my master goeth into the house of Rimmon to worship there, and he leaneth on my hand, and I bow myself in the house of Rimmon, when I bow myself in the house of Rimmon, Jehovah pardon thy servant in this thing." — 2 Kings 5:18 (ASV)

Rimmon is known to us as a god only from this passage. The name is connected with a root meaning “to be high.” Hadad-rimmon (Zechariah 12:11), the name of a place near Megiddo, points to the identity of Rimmon with Hadad, who is known to have been the Sun—the chief object of worship for the Syrians.

When he leaneth on mine hand - The practice of a monarch leaning on the hand of an attendant was not common in the East. It probably implied age or infirmity.

The Lord pardon thy servant in this thing - Naaman was not prepared to offend his master, either by refusing to enter with him into the temple of Rimmon or by remaining erect when the king bowed down and worshiped the god. His conscience seems to have told him that such conduct was not right, but he trusted that it might be pardoned. He appealed to the prophet in the hope of obtaining from him an assurance to this effect.