وَلَقَدْ كَانُوْا عَاهَدُوا اللّٰهَ مِنْ قَبْلُ لَا يُوَلُّوْنَ الْاَدْبَارَؕ وَكَانَ عَهْدُ اللّٰهِ مَسْـُٔوْلًا ١٥
Translation
though they had already pledged to Allah before that they would not turn their backs [to flee], and pledges given to Allah are accountable.