(Al-Baqara) 2 : 76
وَإِذَا لَقُوا الَّذِينَ آمَنُوا قَالُوا آمَنَّا وَإِذَا خَلَا بَعْضُهُمْ إِلَىٰ بَعْضٍ قَالُوا أَتُحَدِّثُونَهُمْ بِمَا فَتَحَ اللَّهُ عَلَيْكُمْ لِيُحَاجُّوكُمْ بِهِ عِنْدَ رَبِّكُمْ ۚ أَفَلَا تَعْقِلُونَ
Whenever they meet with those who believed, they will say: “We believed”, while some among them gather privately, they will say: “Did you report something to them which Lord Allah has disclosed to you, so that they may dispute with you about It in the presence of your Lord? Don’t you think about utilizing your intelligence?”