1 Samuel 10:6-9

6 and the Spirit of Yahweh will come mightily on you, and you shall prophesy with them, and shall be turned into another man.  7 Let it be, when these signs are come to you, that you do as occasion shall serve you; for God is with you.  8 You shall go down before me to Gilgal; and, behold, I will come down to you, to offer burnt offerings, and to sacrifice sacrifices of peace-offerings: seven days shall you wait, until I come to you, and show you what you shall do.  9 It was so, that when he had turned his back to go from Samuel, God gave him another heart: and all those signs happened that day.