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wa-lā tasubbū lladhīna yadʿūna min dūni llāhi fa-yasubbū llāha ʿadwan bi-ghayri ʿilmin ka-dhālika zayyannā li-kulli ʾummatin ʿamalahum thumma ʾilā rabbihim marjiʿuhum fa-yunabbiʾuhum bi-mā kānū yaʿmalūna
Do not abuse those whom they invoke besides Allah, lest they should abuse Allah out of hostility, without any knowledge. That is how to every people We have made their conduct seem decorous. Then their return will be to their Lord and He will inform them concerning what they used to do.
— Ali Quli Qarai
Surah Al-‘An’am, Verse 108
108. "And do not abuse those whom they call upon besides Allah , or they will abuse Allah in revenge without any knowledge. Thus unto every nation have We made their behavior seem fair. Then unto their Lord is their return, so He will inform them of what they used to do."
In this verse, Allah emphasizes on this meaning that idols and deities of the pagans should never be abused. This action causes the holy Essence of Allah to be abused by them, revengefully and unjustly, because of their ignorance. As it is understood from some Islamic traditions, it happened that sometimes some of the believers, who were seriously unbecoming from the phenomenon of idolatry, used indecent language and abused the idols of the pagans.
The Qur'an explicitly prohibited that action. From the point of Islam, having modesty and observing the principles of discipline, and courtesy in speech is necessary for a believer, even if it is before the most superstitious and the worst wrong religions. It is not possible to prevent a person from a wrong way by means of abusing him, because everybody is zealous unto his own beliefs and deeds. The verse says:
However, every sect or group of people think that their conduct is fair, because it is as their nature pleases, but, in the meantime, they have been introduced the Truth in order that they act accordingly and avoid the falsehood. The verse continues saying: