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ʾinnā ʾanzalnā ʾilayka l-kitāba bi-l-ḥaqqi li-taḥkuma bayna n-nāsi bi-mā ʾarāka llāhu wa-lā takun li-l-khāʾinīna khaṣīman
Indeed We have sent down to you the Book with the truth, so that you may judge between the people by what Allah has shown you; do not be an advocate for the traitors,
— Ali Quli Qarai
Surah An-Nisa', Verse 105
Not to take up the cause of the dishonest -the Apostle may pray for his followers-Forgiveness of Allah always there is for those who seek it after evil with the necessary amendment.
105. "Verily We have sent down the Book to you with that you may judge between people by what Allah has shown (taught) you. And be not an advocate for the treacherous."
Basing on what is recorded in some authentic commentary books, once it happened that, in one of the battles, a Muslim stole a chain mail. When he was going to be marked by ignominy, he threw the chain mail into the house of a Jew, and then gathered some men saying that the Jewish person was a thief, not that Muslim. The subject was brought to the Prophet (S) and the verse was revealed, announcing such:
In this verse, at first Allah recommends the Prophet (S) that the purpose of sending down this heavenly Book is that these rules of the truth and equity should be practiced among people. It says:
Then, it awares the Prophet (S) by saying that:
"... And be not an advocate for the treacherous."
It is cited in Majma'-ul-Bayan (vol. 6, p. 32 Persian translation) that although this verse addresses the Prophet (S), the target is the Ummat of the Prophet (S) not the Prophet himself, because, upon the consensus of Ummat, the Prophet (S) is immaculate from all sins and disgraces. Therefore, since the revelation of the Qur'an is based on the truth, the judgements should be performed upon the basis of the truth, too, not upon the relations. Thus, in Islam, treating on justice is also necessary even towards a non-Muslim person, (regarding to the occasion of revelation of the verse).