Luke 7:28-35 describes John the Baptist's role and reception, providing background for the question about the origin of his baptism.

Matthew 17:12 states Elijah (John) has already come and been rejected, revealing why the authorities refused to answer about John's baptism.

Matthew 21:25-27 is the parallel account of this same exchange, with the leaders debating whether John's baptism was from heaven or men.

John 1:6 affirms that John the Baptist was sent from God, directly answering the question about the origin of his baptism.

John 1:19-28 shows priests and Levites questioning John's identity and baptism, parallel to the leaders' dilemma about John's authority.

Matthew 11:7-19 parallels Luke's discourse on John the Baptist, explaining his identity and the people's response to his ministry.