1 Samuel 10:7 (KJV)

After that thou shalt come to the hill of God, where is the garrison of the Philistines: and it shall come to pass, when thou art come thither to the city, that thou shalt meet a company of prophets coming down from the high place with a psaltery, and a tabret, and a pipe, and a harp, before them; and they shall prophesy:

And the Spirit of the Lord will come upon thee, and thou shalt prophesy with them, and shalt be turned into another man.

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

And 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.

And 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.