One day he said, “Samuel, I've rejected Saul, and I refuse to let him be king any longer. Stop feeling sad about him. Put some olive oil in a small container and go and visit a man named Jesse, who lives in Bethlehem. I've chosen one of his sons to be my king.”
he stripped off his clothes and prophesied in front of Samuel. He dropped to the ground and lay there naked all day and night. That's how the saying started, “Is Saul now a prophet?”