John Gill Commentary 2 Kings 8:14

"Then he departed from Elisha, and came to his master; who said to him, What said Elisha to thee? And he answered, He told me that thou wouldest surely recover." — 2 Kings 8:14 (ASV)

So he departed from Elisha, and came to his master Benhadad king of Syria:

who said to him, what said Elisha to you ? concerning his recovery, which was the thing uppermost in his mind, and he was eagerly desirous to know how it would be:

and he answered, he told me that you should surely recover ; which was false; for he only said that he "might", and not that he should; and he concealed what he also declared, that though he might recover of his disease, yet that he should surely die in another way.