Luke 3:14-18

And soldiers also were questioning him, saying, “What are we to do, we as well?” And he said to them, “Do not extort money from anyone, nor harass anyone, and be content with your wages.”

Now while the people were in a state of expectation and they all were thinking carefully in their hearts about John, whether he himself perhaps was the Christ,

John responded to them all, saying, “As for me, I baptize you with water; but He is coming who is mightier than I, and I am not fit to untie the straps of His sandals; He will baptize you with the Holy Spirit and fire.

His winnowing fork is in His hand to thoroughly clear His threshing floor, and to gather the wheat into His barn; but He will burn up the chaff with unquenchable fire.”

So with many other exhortations he preached the gospel to the people.