Repudiation with the heart means believing that the deed is wrong and hating it for that very reason. When this attitude is present, faith resides in the heart; but if the heart loses awareness of what is right and the ability to denounce what is wrong, that faith departs.
A person may seek forgiveness for a sin while still persisting in it, or he may perform good deeds that erase it—completely or in part. He may also reduce the sin itself, and his determination to pursue it can wane once he knows it is objectionable.
Even were we to assume that people would never abandon the wrong or even admit that it is wrong, this would not absolve us from conveying the message and clarifying the truth. Indeed, according to one of the two reports from Imām Aḥmad, and the view of many scholars, the duty to convey and to command right and forbid wrong is not lifted by such circumstances.
This is not the place to examine that matter in detail. All praise is due to Allah for what the Prophet—may Allah bless him and grant him peace—told us: “A group from my community will never cease to be manifest upon the truth until the command of Allah comes.”
These words are not unique to the present question; they apply to every act of evil whose occurrence has been affirmed by the Truthful One.
[Returning to the Qur’anic proofs forbidding imitation of the unbelievers]
Among the evidence in the Qur’an that forbids resembling the disbelievers is His—Exalted be He—statement: