John 4:48 in the King James Version
Then said Jesus unto him, Except ye see signs and wonders, ye will not believe.
Context
47 When he heard that Jesus had come out of Judea into Galilee, he went to him and begged him that he would come down and heal his son, for he was at the point of death.
48 Jesus therefore said to him, “Unless you people see signs and wonders, you will in no way believe.”
49 The nobleman said to him, “Sir, come down before my child dies.”