When all those who had formerly known him saw him prophesying with the prophets, they asked each other, "What is this that has happened to the son of Kish? Is Saul also among the prophets?"
NIV
And when all who knew Saul before saw that he spoke by inspiration among the [schooled] prophets, the people said one to another, What has come over [him, who is nobody but] the son of Kish? Is Saul also among the prophets?
AMP
And it came to pass, when all that knew him beforetime saw that, behold, he prophesied among the prophets, then the people said one to another, What is this that is come unto the son of Kish? Is Saul also among the prophets?
KJV