الاحزاب — Al-Ahzab Ayat 15
وَلَقَدْ كَانُوْا عَاهَدُوا اللّٰهَ مِنْ قَبْلُ لَا يُوَلُّوْنَ الْاَدْبَارَ ۗوَكَانَ عَهْدُ اللّٰهِ مَسْـُٔوْلًا
Wa laqad kānū ‘āhadullāha min qablu lā yuwallūnal-adbār(a), wa kāna ‘ahdullāhi mas'ūlā(n).
"And they had already promised Allah before not to turn their backs and flee. And ever is the promise to Allah [that about which one will be] questioned."