The root ع ذ ر (ʿ-dh-r) in the Quran

وَإِذْ قَالَتْ أُمَّةٌ مِّنْهُمْ لِمَ تَعِظُونَ قَوْمًا ٱللَّهُ مُهْلِكُهُمْ أَوْ مُعَذِّبُهُمْ عَذَابًا شَدِيدًا قَالُوا۟ مَعْذِرَةً إِلَىٰ رَبِّكُمْ وَلَعَلَّهُمْ يَتَّقُونَ ۝١٦٤

And when a community among them said, "Why do you advise [or warn] a people whom Allāh is [about] to destroy or to punish with a severe punishment?" they [the advisors] said, "To be absolved before your Lord and perhaps they may fear Him."

لَا تَعْتَذِرُوا۟ قَدْ كَفَرْتُم بَعْدَ إِيمَٰنِكُمْ إِن نَّعْفُ عَن طَآئِفَةٍ مِّنكُمْ نُعَذِّبْ طَآئِفَةًۢ بِأَنَّهُمْ كَانُوا۟ مُجْرِمِينَ ۝٦٦

Make no excuse; you have disbelieved [i.e., rejected faith] after your belief. If We pardon one faction of you - We will punish another faction because they were criminals.

وَجَآءَ ٱلْمُعَذِّرُونَ مِنَ ٱلْأَعْرَابِ لِيُؤْذَنَ لَهُمْ وَقَعَدَ ٱلَّذِينَ كَذَبُوا۟ ٱللَّهَ وَرَسُولَهُۥ سَيُصِيبُ ٱلَّذِينَ كَفَرُوا۟ مِنْهُمْ عَذَابٌ أَلِيمٌ ۝٩٠

And those with excuses among the bedouins came to be permitted [to remain], and they who had lied to Allāh and His Messenger sat [at home]. There will strike those who disbelieved among them a painful punishment.

يَعْتَذِرُونَ إِلَيْكُمْ إِذَا رَجَعْتُمْ إِلَيْهِمْ قُل لَّا تَعْتَذِرُوا۟ لَن نُّؤْمِنَ لَكُمْ قَدْ نَبَّأَنَا ٱللَّهُ مِنْ أَخْبَارِكُمْ وَسَيَرَى ٱللَّهُ عَمَلَكُمْ وَرَسُولُهُۥ ثُمَّ تُرَدُّونَ إِلَىٰ عَٰلِمِ ٱلْغَيْبِ وَٱلشَّهَٰدَةِ فَيُنَبِّئُكُم بِمَا كُنتُمْ تَعْمَلُونَ ۝٩٤

They will make excuses to you when you have returned to them. Say, "Make no excuse - never will we believe you. Allāh has already informed us of your news [i.e., affair]. And Allāh will observe your deeds, and [so will] His Messenger; then you will be taken back to the Knower of the unseen and the witnessed, and He will inform you of what you used to do."

قَالَ إِن سَأَلْتُكَ عَن شَىْءٍۭ بَعْدَهَا فَلَا تُصَٰحِبْنِى قَدْ بَلَغْتَ مِن لَّدُنِّى عُذْرًا ۝٧٦

[Moses] said, "If I should ask you about anything after this, then do not keep me as a companion. You have obtained from me an excuse."

فَيَوْمَئِذٍ لَّا يَنفَعُ ٱلَّذِينَ ظَلَمُوا۟ مَعْذِرَتُهُمْ وَلَا هُمْ يُسْتَعْتَبُونَ ۝٥٧

So that Day, their excuse will not benefit those who wronged, nor will they be asked to appease [Allāh].

يَوْمَ لَا يَنفَعُ ٱلظَّٰلِمِينَ مَعْذِرَتُهُمْ وَلَهُمُ ٱللَّعْنَةُ وَلَهُمْ سُوٓءُ ٱلدَّارِ ۝٥٢

The Day their excuse will not benefit the wrongdoers, and they will have the curse, and they will have the worst home [i.e., Hell].

يَٰٓأَيُّهَا ٱلَّذِينَ كَفَرُوا۟ لَا تَعْتَذِرُوا۟ ٱلْيَوْمَ إِنَّمَا تُجْزَوْنَ مَا كُنتُمْ تَعْمَلُونَ ۝٧

O you who have disbelieved, make no excuses that Day. You will only be recompensed for what you used to do.

وَلَوْ أَلْقَىٰ مَعَاذِيرَهُۥ ۝١٥

Even if he presents his excuses.

عُذْرًا أَوْ نُذْرًا ۝٦

As justification or warning,

وَلَا يُؤْذَنُ لَهُمْ فَيَعْتَذِرُونَ ۝٣٦

Nor will it be permitted for them to make an excuse.