Roman Catechism 15.60

Chapter 15 — Part II: The Sacraments — Introduction on the Sacraments in General

Section 60. Judas Iscariot, as the holy Fathers infer from the Gospel of St. John, conferred Baptism on many; and yet none of those whom he baptised are recorded to have been baptised again. To use the memorable words of St. Augustine: Judas baptised, and yet after him none were rebaptised; John baptised, and after John they were rebaptised . For the Baptism administered by Judas was the Baptism of Christ, but that administered by John was the baptism of John. Not that we prefer Judas to John, but that we justly prefer the Baptism of Christ, although administered by Judas, to that of John although administered by the hands of John.