John the Baptist
John the Baptizer

John the Baptizer and Jesus' disciples already had baptized many individuals.

"Oh no, cousin, for even in Holy Scripture, it is told how men asked of John the Baptizer who he was.

John the Baptizer: A Novel (2009)

Gnostic John the Baptizer: Selections from the Mandæan John-Book (1924)

While Matthew and Luke refer to John the Baptist, Mark refers to him by the slightly different title "John the Baptizer."

John the Baptist (also called John the Baptizer or Yahya the Baptizer) is viewed as a prophet by at least three religions: Christianity, Islam, and Mandaeanism.

For he, I seem to remember, was greatly chided that he consorted with outcasts and sinners and even tax collectors, and such ladies as the Magdalen, when they would have had him a Nazarite like to John the Baptizer.

Gnostic John the Baptizer: Selections from the Mandæan John-Book: This is the complete 1924 edition of G.R.S. Mead's classic study of the Mandæan John-Book (in The Gnosis Archive collection - www.gnosis.org).