﴿ وَجَآءَ ٱلْمُعَذِّرُونَ مِنَ ٱلْأَعْرَابِ لِيُؤْذَنَ لَهُمْ وَقَعَدَ ٱلَّذِينَ كَذَبُوا۟ ٱللَّهَ وَرَسُولَهُۥ ۚ سَيُصِيبُ ٱلَّذِينَ كَفَرُوا۟ مِنْهُمْ عَذَابٌ أَلِيمٌۭ ﴾

“AND THERE came [unto the Apostle] such of the bedouin as had some excuse to offer, [with the request] that they be granted exemption, whereas those who were bent on giving the lie to God and His Apostle [simply] remained at home. [And] grievous suffering is bound to befall such of them as are bent on denying the truth!”

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 gave them leave to do so. And those who lied to God and His Messenger by feigning belief those hypocrites among the Bedouin stayed behind refraining from coming to give their excuses — a painful chastisement shall befall those of them who disbelieve.