Al Maidah, 61 Ayah
5:61
وَإِذَا جَآءُوكُمۡ قَالُوٓاْ ءَامَنَّا وَقَد دَّخَلُواْ بِٱلۡكُفۡرِ وَهُمۡ قَدۡ خَرَجُواْ بِهِۦۚ وَٱللَّهُ أَعۡلَمُ بِمَا كَانُواْ يَكۡتُمُونَ ٦١
Wa 'Idhā Jā'ūkum Qālū 'Āmannā Wa Qad Dakhalū Bil-Kufri Wa Hum Qad Kharajū Bihi Wa ۚ Allāhu 'A`lamu Bimā Kānū Yaktumūna
And when they come to you, they say, "We believe." But they have entered with disbelief [in their hearts], and they have certainly left with it. And Allah is most knowing of what they were concealing.