"Verily! As for those whom the angels take (in death) while they are wronging themselves (as they stayed among the disbelievers even though emigration was obligatory for them), they (angels) say (to them): In what (condition) were you?..."(V.4:97)

Sahih al-Bukhari · Book 65 · Hadith 4596

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يَزِيدَ الْمُقْرِئُ، حَدَّثَنَا حَيْوَةُ، وَغَيْرُهُ، قَالاَ حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ الرَّحْمَنِ أَبُو الأَسْوَدِ، قَالَ قُطِعَ عَلَى أَهْلِ الْمَدِينَةِ بَعْثٌ فَاكْتُتِبْتُ فِيهِ، فَلَقِيتُ عِكْرِمَةَ مَوْلَى ابْنِ عَبَّاسٍ فَأَخْبَرْتُهُ، فَنَهَانِي عَنْ ذَلِكَ أَشَدَّ النَّهْىِ، ثُمَّ قَالَ أَخْبَرَنِي ابْنُ عَبَّا…

Narrated Muhammad bin `Abdur-Rahman Abu Al-Aswad: The people of Medina were forced to prepare an army (to fight against the people of Sham during the caliphate of `Abdullah bin Az-Zubair at Mecca), and I was enlisted in…