Why was David about to kill the rich man Nabal?

ANSWER

Nabal repaid him evil for good

1st Samuel 25 :

20 As she came riding her donkey into a mountain ravine, there were David and his men descending toward her, and she met them. 21 David had just said, “It’s been useless—all my watching over this fellow’s property in the wilderness so that nothing of his was missing. He has paid me back evil for good. 22 May God deal with David, be it ever so severely, if by morning I leave alive one male of all who belong to him!”
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