1 Samuel 10:11-12

11People who already knew Saul could not understand what was happening. When they saw him prophesying along with the prophets, they asked each other, ‘What has happened to this son of Kish? Has Saul himself become a prophet?’

12A man who lived in Gibeah asked, ‘Do you know who is the father of all these prophets?’ Because of what happened, it became a proverb to say, ‘Has Saul himself become a prophet?’