What is the meaning of Luke 3:12-13?

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Reference

12 Then came also publicans to be baptized, and said unto him, Master, what shall we do? 13 And he said unto them, Exact no more than that which is appointed you. (Luke 3:12-13 KJV)

William Burkitt’s Commentary

The publicans were persons employed by the Romans to gather the tax of tribute among the Jews, who were now tributaries to the Romans, and paid them a public revenue. These publicans were great oppressors, exacting more than was the emperor’s due. Therefore we find the publicans and sinners so often joined together in the gospel. These men enquiring what fruits of repentance they should bring forth, St. John directs them to acts of justice: Exact not.

Where note, 1. That acts of justice and righteousness, as well as of charity and mercy, are real fruits of sincere repentance.

Observe, 2. John does not condemn the office but cautions the officer. If magistrates may impose taxes, they may doubtless appoint officers to collect those taxes. Christian charity then must always teach us to distinguish betwixt the calling and the crime. We must not censure any office, either in church or state, for the sake of their mal-administration who are employed in that office.