Before he came, John the Baptist preached that all the people of Israel needed to repent of their sins and turn to God and be baptized.
This is the Good News about Jesus the Messiah, the Son of God. It began
“And you, my little son, will be called the prophet of the Most High, because you will prepare the way for the Lord.
from the time he was baptized by John until the day he was taken from us. Whoever is chosen will join us as a witness of Jesus’ resurrection.”
You know what happened throughout Judea, beginning in Galilee, after John began preaching his message of baptism.