Pickthall
Al-Ahzab · 33:15
وَلَقَدْ كَانُوا عَاهَدُوا اللَّهَ مِنْ قَبْلُ لَا يُوَلُّونَ الْأَدْبَارَ ۚ وَكَانَ عَهْدُ اللَّهِ مَسْئُولًا
And verily they had already sworn unto Allah that they would not turn their backs (to the foe). An oath to Allah must be answered for.