'Preaching' in the Bible

In those days John the Baptist appeared, preaching in the Wilderness of Judea [along the western side of the Dead Sea] and saying,

And He went throughout all Galilee, teaching in their synagogues and preaching the good news (gospel) of the kingdom, and healing every kind of disease and every kind of sickness among the people [demonstrating and revealing that He was indeed the promised Messiah].

The men of Nineveh will stand up [as witnesses] at the judgment against this generation, and will condemn it because they repented at the preaching of Jonah; and now, something greater than Jonah is here.