Gevurot Meyruach Hakodesh 9:17-18

And Chananyah departed and entered into the bais, and having placed his hands upon Rav Sha'ul, he said, Ach b'Moshiach Sha'ul, [Moshiach] HaAdon has sent me. I'm referring to Yehoshua, the one who appeared to you on the derech by which you were coming. He sent me that you may see again and may be filled with the Ruach Hakodesh. And immediately there fell from his eyes something like scales, and Rav Sha'ul saw again, and, having got up, he submitted to Moshiachʼs tevilah of teshuva.