1 Samuel 10:9-11

Amplified Bible

⁹ Then it happened when Saul turned his back to leave Samuel, God changed his heart; and all those signs came to pass that day. ¹⁰ When they came to the hill [Gibeah], behold, a group of prophets met him; and the Spirit of God came on him mightily, and he prophesied [under divine guidance] among them. ¹¹ Now when all who knew Saul previously saw that he actually prophesied now [by inspiration] with the prophets, the people said one to another, “What has happened to [Saul, who is nobody but] the son of Kish? Is Saul also among the prophets?”