Word by Word Analysis

نَّحْنُ أَعْلَمُ بِمَا يَقُولُونَ إِذْ يَقُولُ أَمْثَلُهُمْ طَرِيقَةً إِن لَّبِثْتُمْ إِلَّا يَوْمًا 104

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."