Surah Al-An'am (The Cattle), Verse 68

وَاِذَا رَاَیْتَ الَّذِیْنَ یَخُوْضُوْنَ فِیْۤ اٰیٰتِنَا فَاَعْرِضْ عَنْهُمْ حَتّٰی یَخُوْضُوْا فِیْ حَدِیْثٍ غَیْرِهٖ وَاِمَّا یُنْسِیَنَّكَ الشَّیْطٰنُ فَلَا تَقْعُدْ بَعْدَ الذِّكْرٰی مَعَ الْقَوْمِ الظّٰلِمِیْنَ ۟

Wa izaa ra aital lazeena yakhoodoona feee Aayaatinaa fa a'rid 'anhum hattaa yakkhoodoo fee hadeesin ghairih; wa immaa yunsiyannakash Shaitaanu falaa taq'ud ba'dazzikraa ma'al qawmiz zaalimeen

“When thou seest men engaged in vain discourse about Our signs, turn away from them unless they turn to a different theme. If Satan ever makes thee forget, then after recollection, sit not thou in the company of those who do wrong.”

Quran 6:68 (Yusuf Ali Translation)