Regret of the disbelievers

نَّحْنُ أَعْلَمُ بِمَا يَقُولُونَ إِذْ يَقُولُ أَمْثَلُهُمْ طَرِيقَةً إِن لَّبِثْتُمْ إِلَّا يَوْمًا

We are most knowing of what they say when the best of them in manner [i.e., wisdom or speech] will say, "You remained not but one day."

لَكُنَّا عِبَادَ ٱللَّهِ ٱلْمُخْلَصِينَ

We would have been the chosen servants of Allāh."