¹⁰and said, "Everyone brings out the choice wine first and then the cheaper wine after the guests have had too much to drink; but you have saved the best till now."  ¹¹This, the first of his miraculous signs, Jesus performed in Cana of Galilee. He thus revealed his glory, and his disciples put their faith in him.
John 2:10-11 (New International Version)

⁴⁷When this man heard that Jesus had arrived in Galilee from Judea, he went to him and begged him to come and heal his son, who was close to death.  ⁴⁸"Unless you people see miraculous signs and wonders," Jesus told him, "you will never believe."  ⁴⁹The royal official said, "Sir, come down before my child dies."  ⁵⁰Jesus replied, "You may go. Your son will live." The man took Jesus at his word and departed.
John 4:47-50 (New International Version)

³⁰Jesus did many other miraculous signs in the presence of his disciples, which are not recorded in this book. ³¹But these are written that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life in his name. 
John 20:30-31 (New International Version)