John Gill Commentary 2 Kings 8:9

"So Hazael went to meet him, and took a present with him, even of every good thing of Damascus, forty camels` burden, and came and stood before him, and said, Thy son Benhadad king of Syria hath sent me to thee, saying, Shall I recover of this sickness?" — 2 Kings 8:9 (ASV)

So Hazael went to meet him, and took a present with him
As was usual when a prophet or seer was consulted, see (1 Samuel 9:7)

even of every good thing of Damascus ;
which was a very fruitful place, and had abundance of gardens and orchards in it, which yielded excellent fruit, and of such it is probable the present consisted, and which was large:

even forty camels' burden ;
which, as they are strong creatures, will bear a great deal. Abarbinel thinks, bread, flesh, and wine, and fowls, were in the present, but not gold, silver, and raiment, which the prophet had refused to take of Naaman; the Jews have a fable, that there was a precious stone in it, worth all the good things of Damascus:

and came and stood before him, and said, your son Benhadad, king of
Syria, has sent me to you, saying, shall I recover of this disease ?
he calls him his son, in veneration of the prophet as a father, as such men were called.