AL BAQARAH — Ayat 76

وَإِذَا لَقُواْ الَّذِينَ آمَنُواْ قَالُواْ آمَنَّا وَإِذَا خَلاَ بَعْضُهُمْ إِلَىَ بَعْضٍ قَالُواْ أَتُحَدِّثُونَهُم بِمَا فَتَحَ اللّهُ عَلَيْكُمْ لِيُحَآجُّوكُم بِهِ عِندَ رَبِّكُمْ أَفَلاَ تَعْقِلُونَ

And when they meet those who believe, they say, "We have believed"; but when they are alone with one another, they say, "Do you talk to them about what Allah has revealed to you so they can argue with you about it before your Lord?" Then will you not reason?