Surah Al-Mai'dah (The Spread Table), Verse 61

وَاِذَا جَآءُوْكُمْ قَالُوْۤا اٰمَنَّا وَقَدْ دَّخَلُوْا بِالْكُفْرِ وَهُمْ قَدْ خَرَجُوْا بِهٖ وَاللّٰهُ اَعْلَمُ بِمَا كَانُوْا یَكْتُمُوْنَ ۟

Wa izaa jaaa'ookum qaalooo aamannaa wa qad dakhaloo bilkufri wa hum qad kharajoo bih; wallaahu a'lamu bimaa kaanoo yaktumoon

“When they come to thee, they say: "We believe": but in fact they enter with a mind against Faith, and they go out with the same but Allah knoweth fully all that they hide.”

Quran 5:61 (Yusuf Ali Translation)