Such acts of admonishing against corruption and ordering to...
Such acts of admonishing against corruption and ordering to do what is right are not possible except after testifying to the Honorable the Exalted God and the recognition of the One who enjoins good and the One who admonishes. Were the people left without testifying to the Honorable the Exalted God and His recognition, enjoining to do right and admonishing against corruption, would not get established since there was no known enjoiner to do the right and admonished against corruption.
We also know that there are some people who commit corruption in hiding away from public sight. Were it not for the sake of testifying to God and fearing Him in private, everyone would engage in lustful deeds in private without any fear of anyone. Knowing that no one is aware of what he does, one would go to the extreme in committing the forbidden deeds and major sins, since what he does is hidden from the people. This would lead to the destruction of all the people.