Surah At-Tawbah 9:90

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

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.

Translation: Saheeh International

Tafsir

And those Bedouins who had an excuse al-mu‘adhdhirūn the original tā’ has been assimilated with the dāl in other words it would usually be read as al-mu‘tadhirūn which itself is a variant reading those of them who were excused came to the Prophet s asking for leave to stay behind on account of their excuses and so he …

Excerpt from Tafsir al-Jalalayn, commentary on 9:90, via Quran.com. The reader has the full commentary and 9 more tafsirs.