WHY did Hazael a non-believer recognize the authority of Eliajh?

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Reference to 1 Kings 19: 15: God commanded Elijah to anoint Hazael king over Aram. But given that Hazael was a foreigner and non-believer who supposedly didn’t acknowledge God, why would he recognize the authority of Eliajh and thus submit to God even it was for becoming king.

I recognize that the scripture doesn’t say if Eliajh actually anointed Hazael as king or not. But in case he did, wouldn’t this act considered as Hazael accepting the authority of Eliajh and thus God, which tells that he became a believer.