The Passion of Saint John the Baptist: “It is not lawful for you to have your brother’s wife.”

“What shall I ask for?”
She replied, “The head of John the Baptist.”
The girl hurried back to the king’s presence and made her request,
“I want you to give me at once
on a platter the head of John the Baptist.”
The king was deeply distressed,
but because of his oaths and the guests
he did not wish to break his word to her.
So he promptly dispatched an executioner with orders
to bring back his head.
He went off and beheaded him in the prison.

-- Mk 6:17-29

John the Baptist is "more than a prophet." In him, the Holy Spirit concludes his speaking through the prophets. John completes the cycle of prophets begun by Elijah. He proclaims the imminence of the consolation of Israel; he is the "voice" of the Consoler who is coming. As the Spirit of truth will also do, John "came to bear witness to the light." In John's sight, the Spirit thus brings to completion the careful search of the prophets and fulfills the longing of the angels. "He on whom you see the Spirit descend and remain, this is he who baptizes with the Holy Spirit. And I have seen and have borne witness that this is the Son of God. . . . Behold, the Lamb of God."

-- CCC 719

Art: Salome with the head of John the Baptist, Caravaggio, c. 1607. National Gallery, London.