The Holy Quran 4:140 — Surah An-Nisa
Arabic text
وَقَدْ نَزَّلَ عَلَيْكُمْ فِى ٱلْكِتَـٰبِ أَنْ إِذَا سَمِعْتُمْ ءَايَـٰتِ ٱللَّهِ يُكْفَرُ بِهَا وَيُسْتَهْزَأُ بِهَا فَلَا تَقْعُدُوا۟ مَعَهُمْ حَتَّىٰ يَخُوضُوا۟ فِى حَدِيثٍ غَيْرِهِۦٓ ۚ إِنَّكُمْ إِذًا مِّثْلُهُمْ ۗ إِنَّ ٱللَّهَ جَامِعُ ٱلْمُنَـٰفِقِينَ وَٱلْكَـٰفِرِينَ فِى جَهَنَّمَ جَمِيعًا
Translation
It has already been revealed to you in the Book (in the Qur'aan in verse 68 of Surah 6) that when you hear the Aayaat of Allaah being rejected (by the Kuffaar) and ridiculed, you should not sit with them until they engage in other talks (in some other conversation). Without doubt, in that case (if you remain with them when they ridicule Allaah's Aayaat), you will be just like them. Surely Allaah will gather the Munaafiqeen and the Kaafiroon all together in Jahannam.
Tafsir (excerpt) — Tafsir Usmani
Do not sit in the gatherings of those who mock Islam: that is, O Muslims, Almighty Allah has already sent down to you a command in the Noble Quran: never sit in a gathering where the commands of Allah are denied and ridiculed, otherwise you too will be regarded as being like them.
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