1 Samuel 10:9-12 Holman Christian Standard Bible (HCSB)
9 When Saul turned around[a] to leave Samuel, God changed his heart,[b] and all the signs came about that day. 10 When Saul and his attendant arrived at Gibeah, a group of prophets met him. Then the Spirit of God took control of him, and he prophesied along with them.
11 Everyone who knew him previously and saw him prophesy with the prophets asked each other, “What has happened to the son of Kish? Is Saul also among the prophets?”
12 Then a man who was from there asked, “And who is their father?”
As a result, “Is Saul also among the prophets?” became a popular saying.