How do we know John the Baptist is the prophet mentioned in Malachi?

John the Baptist fulfills the prophecy of Malachi as he comes in the spirit and power of Elijah, as affirmed by Jesus in Matthew 11:14. This connection shows that God’s revelations through His prophets are consistent and lead to Christ. John’s declaration, 'Behold the Lamb of God,' emphasizes his role in pointing to Jesus as the Messiah, thereby confirming his identity as the prophet who prepares the way for the Lord's coming. This prophetic duty underscores the importance of God’s continuous communication with humanity through His chosen messengers.