Surah Al-Baqarah, Verse 204

وَمِنَ ٱلنَّاسِ مَن يُعۡجِبُكَ قَوۡلُهُۥ فِي ٱلۡحَيَوٰةِ ٱلدُّنۡيَا وَيُشۡهِدُ ٱللَّهَ عَلَىٰ مَا فِي قَلۡبِهِۦ وَهُوَ أَلَدُّ ٱلۡخِصَامِ٢٠٤

wamina l-nāsi man yuʿ'jibuka qawluhu fī l-ḥayati l-dun'yā wayush'hidu l-laha ʿalā mā fī qalbihi wahuwa aladdu l-khiṣāmi

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.