وَٱلَّذِينَ لَا يَشْهَدُونَ ٱلزُّورَ وَإِذَا مَرُّوا۟ بِٱللَّغْوِ مَرُّوا۟ كِرَامًا · وَٱلَّذِينَ إِذَا ذُكِّرُوا۟ بِـَٔايَٰتِ رَبِّهِمْ لَمْ يَخِرُّوا۟ عَلَيْهَا صُمًّا وَعُمْيَانًا · وَٱلَّذِينَ يَقُولُونَ رَبَّنَا هَبْ لَنَا مِنْ أَزْوَٰجِنَا وَذُرِّيَّٰتِنَا قُرَّةَ أَعْيُنٍ وَٱجْعَلْنَا لِلْمُتَّقِينَ إِمَامًا
"They do not bear witness to falsehood; and when they pass by idle talk, they pass by with dignity. When the signs of their Lord are recalled to them, they do not fall down upon them deaf and blind. And they say: 'Our Lord! Grant us, of our spouses and our offspring, a coolness of the eyes; and make us a leader for those who guard themselves.'"
The root ل-غ-و was analysed at al-Wāqiʿa 56/25, and it occurred at Fuṣṣilat 41/26 as a tactic and at al-Qaṣaṣ 28/55 as a response. The fourth link is here.
I record this as my own reading: the verse describes neither stopping nor quarrelling. A qualifier is set beside the verb "to pass": kirām. That is, the matter is how one passes by idle talk.
The build of the sentence is striking, and the lexicographers dwell on it: what is negated is not falling down — it is falling down deaf and blind.
That is, the verse does not refuse falling prostrate before the signs; it enters the qualifier ṣumman wa ʿumyānā. I record this as an observation about the word order: the acceptance is granted, but how it is made is laid down as a condition.
إِمَام — this word was treated at al-Qaṣaṣ 28/5 and 28/41, and it was set out in a table there that the same word is used in two opposite directions (the weak being made leaders / leaders who call to the fire). I rely on that treatment.
The difference here must be recorded: it is inside a prayer that the word occurs — what is asked for is leadership. And a qualifier is entered: li'l-muttaqīn — a leader for those who guard themselves.
I record this as my own reading: what is asked for is not a position but a particular function within a particular community. It was recorded in al-Qaṣaṣ that leadership on its own states no value; this prayer carries that qualification within itself.
قُرَّةَ أَعْيُنٍ — "a coolness of the eyes". The lexicographers explain the idiom by the eye's coming to rest in one place and not straying elsewhere: qarra — to settle, to become fixed. That is, the eye's settling in peace upon one place.