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Al-Ma'idah · 5:61
وَإِذَا جَاءُوكُمْ قَالُوا آمَنَّا وَقَدْ دَخَلُوا بِالْكُفْرِ وَهُمْ قَدْ خَرَجُوا بِهِ ۚ وَاللَّهُ أَعْلَمُ بِمَا كَانُوا يَكْتُمُونَ
When they come unto you (Muslims), they say: We believe; but they came in unbelief and they went out in the same; and Allah knoweth best what they were hiding.