Surah Al-An'am (The Cattle), Verse 108

وَلَا تَسُبُّوا الَّذِیْنَ یَدْعُوْنَ مِنْ دُوْنِ اللّٰهِ فَیَسُبُّوا اللّٰهَ عَدْوًا بِغَیْرِ عِلْمٍ كَذٰلِكَ زَیَّنَّا لِكُلِّ اُمَّةٍ عَمَلَهُمْ ثُمَّ اِلٰی رَبِّهِمْ مَّرْجِعُهُمْ فَیُنَبِّئُهُمْ بِمَا كَانُوْا یَعْمَلُوْنَ ۟

Wa laa tasubbul lazeena yad'oona min doonil laahi fa yasubbul laaha 'adwam bighairi 'ilm; kazaalika zaiyannaa likulli ummatin 'amalahum summa ilaa Rabbihim marji'uhum fa yunabbi'uhum bimaa kaanoo ya'maloon

“Revile not ye those whom they call upon besides Allah, lest they out of spite revile Allah in their ignorance. Thus have We made alluring to each people its own doings. In the end will they return to their Lord, and We shall then tell them the truth of all that they did.”

Quran 6:108 (Yusuf Ali Translation)