The Arabs made up excuses, and came to you seeking permission to stay behind. This is indicative of their rejection of God and His messenger – they stay behind. Indeed, those who disbelieve among them have incurred a painful retribution.
وَجاءَ المُعَذِّرونَ مِنَ الأَعرابِ لِيُؤذَنَ لَهُم وَقَعَدَ الَّذينَ كَذَبُوا اللَّهَ وَرَسولَهُ سَيُصيبُ الَّذينَ كَفَروا مِنهُم عَذابٌ أَليمٌ
wa jaaa’al mu’az ziroona minal A’raabi liyu’zana lahum wa qa’adal lazeena kazabul laaha wa Rasoolah; sayuseebul lazeena kafaroo minhum ‘azaabun aleem