Abu Aiyub (RAA) narrated that:

'This verse was revealed concerning us (al-Ansar).' He was referring to the verse, “And do not throw yourselves into destruction (2:195). Abu Aiyub said that to answer those who disapproved of the action of those who attacked the Romans till they were amidst their army.’ Related by the three Imams, and At-Tirmidhi, Ibn Hibban and Al-Hakim graded it as Sahih.

وَعَنْ أَبِي أَيُّوبَ ‏- رضى الله عنه ‏- قَالَ: إِنَّمَا أُنْزِلَتْ هَذِهِ اَلْآيَةُ فِينَا مَعْشَرَ اَلْأَنْصَارِ, يَعْنِي: ﴿ وَلَا تُلْقُوا بِأَيْدِيكُمْ إِلَى اَلتَّهْلُكَةِ ﴾ [1]‏ قَالَهُ رَدًّا عَلَى مَنْ أَنْكَرَ عَلَى مَنْ حَمَلَ عَلَى صَفِ اَلرُّومِ حَتَّى دَخَلَ فِيهِمْ .‏ رَوَاهُ اَلثَّلَاثَةُ, وَصَحَّحَهُ اَلتِّرْمِذِيُّ, وَابْنُ حِبَّانَ, وَالْحَاكِمُ [2]‏ .‏