Al-Baqarah 2:204

Wamina annasi man yuAAjibukaqawluhu fee alhayati addunyawayushhidu Allaha AAala ma fee qalbihiwahuwa aladdu alkhisam

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.

Among men there is one whose speech, in this life, attracts you; he even makes Allah his witness on what is in his heart, while he is extremely quarrelsome.