1 Samuel 10:9

7And let it be, when these signs are come unto thee, that thou do as occasion serve thee; for God is with thee.

8And thou shalt go down before me to Gilgal; and, behold, I will come down unto thee, to offer burnt offerings, and to sacrifice sacrifices of peace offerings: seven days shalt thou tarry, till I come to thee, and shew thee what thou shalt do.

9And it was so, that when he had turned his back to go from Samuel, God gave him another heart: and all those signs came to pass that day.

10And when they came thither to the hill, behold, a company of prophets met him; and the Spirit of God came upon him, and he prophesied among them.

11And it came to pass, when all that knew him beforetime saw that, behold, he prophesied among the prophets, then the people said one to another, What is this that is come unto the son of Kish? Is Saul also among the prophets?