These five arguments are listed below in order of strongest argument to weakest:
(1) Lamb of God: 1:29
(2) Passages Referring to Hearing, Keeping, Perseverance, and Love
(3) John the Baptist and Baptism: 1:25ff 3:23 10:40
(4) The Stone Waterpots at the Wedding in Cana: John 2:1–12
(5) The Samaritan Woman: 4:16–18
The final two essentially contain no connection whatsoever to repentance; the first three may allude to repentance, but the exegetical ground was somewhat shaky.