Jamieson, Fausset and Brown on 2 Kings 8:9

9. forty camels' burden--The present, consisting of the rarest and most valuable produce of the land, would be liberal and magnificent. But it must not be supposed it was actually so large as to require forty camels to carry it. The Orientals are fond of display, and would, ostentatiously, lay upon forty beasts what might very easily have been borne by four.

Thy son Ben-hadad--so called from the established usage of designating the prophet "father." This was the same Syrian monarch who had formerly persecuted him (see 2Ki 6:13, 14).