1 Samuel 10:6-11

Then the Spirit of the LORD will come upon you mightily, and you will prophesy with them, and you will be changed into another man. When these signs come to you, do for yourself whatever the situation requires, for God is with you. You shall go down ahead of me to Gilgal; and behold, I will be coming down to you to offer burnt offerings and to sacrifice peace offerings. You shall wait seven days until I come to you and show you what you must do.” Then it happened when Saul turned his back to leave Samuel, God changed his heart; and all those signs came to pass that day. 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. 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?”