John 4:46-48

Therefore He came again to Cana of Galilee where He had made the water wine. And there was a royal official whose son was sick at Capernaum. When he heard that Jesus had come out of Judea into Galilee, he went to Him and was imploring Him to come down and heal his son; for he was at the point of death. So Jesus said to him, “Unless you people see signs and wonders, you simply will not believe.”