Quran Al-Baqarah 2:204
وَمِنَ ٱلنَّاسِ مَن يُعۡجِبُكَ قَوۡلُهُۥ فِي ٱلۡحَيَوٰةِ ٱلدُّنۡيَا وَيُشۡهِدُ ٱللَّهَ عَلَىٰ مَا فِي قَلۡبِهِۦ وَهُوَ أَلَدُّ ٱلۡخِصَامِ ٢٠٤
Translation
And of the people is he whose speech pleases you in worldly life, and he calls Allāh to witness as to what is in his heart, yet he is the fiercest of opponents.