وَمِنَ ٱلنَّاسِ مَن يُعۡجِبُكَ قَوۡلُهُۥ فِي ٱلۡحَيَوٰةِ ٱلدُّنۡيَا وَيُشۡهِدُ ٱللَّهَ عَلَىٰ مَا فِي قَلۡبِهِۦ وَهُوَ أَلَدُّ ٱلۡخِصَامِ ٢٠٤
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.
Translation: Saheeh International (English)
Each word's meaning and sound
There is a type of person who is actually a Hypocrite, but his speech with respect to the life of this world impresses you, O Prophet, and you consider him to be honest and sincere because of his wonderful words. However, his only goal in speaking words of faith is to protect his personal and financial interests. He calls Allah to witness that he has faith and goodness in his heart whilst he is in fact lying: he bears great hostility and hatred for the Muslims.
Al-Mukhtasar in interpreting the Noble Quran