I Samuel 10:6-11

Then the Spirit of the LORD will come upon you, and you will prophesy with them and be turned into another man. And let it be, when these signs come to you, that you do as the occasion demands; for God is with you. You shall go down before me to Gilgal; and surely I will come down to you to offer burnt offerings and make sacrifices of peace offerings. Seven days you shall wait, till I come to you and show you what you should do.” So it was, when he had turned his back to go from Samuel, that God gave him another heart; and all those signs came to pass that day. When they came there to the hill, there was a group of prophets to meet him; then the Spirit of God came upon him, and he prophesied among them. And it happened, when all who knew him formerly saw that he indeed prophesied among the prophets, that the people said to one another, “What is this that has come upon the son of Kish? Is Saul also among the prophets?”