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وَإِذَا لَقُواْ ٱلَّذِينَ آمَنُواْ قَالُوۤاْ آمَنَّا وَإِذَا خَلاَ بَعْضُهُمْ إِلَىٰ بَعْضٍ قَالُوۤاْ أَتُحَدِّثُونَهُم بِمَا فَتَحَ ٱللَّهُ عَلَيْكُمْ لِيُحَآجُّوكُم بِهِ عِنْدَ رَبِّكُمْ أَفَلاَ تَعْقِلُونَ
أَوَلاَ يَعْلَمُونَ أَنَّ ٱللَّهَ يَعْلَمُ مَا يُسِرُّونَ وَمَا يُعْلِنُونَ
-Al-Baqarah ( البقرة )

Al Qushairi Tafsir

And when they meet those who believe, they say, “We believe”; but when they go in private one to another, they say: “Do you speak to them of what God has disclosed to you, so that they may thereby dispute with you before your Lord? Have you no understanding?”
Do they not know that God knows what they keep secret and what they proclaim?
They encouraged one another among themselves to reject the Real and to hide the situation from the Muslims. But they did not know that God was informing His Messenger (عليه السلام) of their secrets, and that a light the Real makes manifest cannot be extinguished by the efforts of anyone other than Him. When the tongue agrees but the mind162 objects, it only increases separation.