33:15
وَلَقَدۡ كَانُوا۟ عَـٰهَدُوا۟ ٱللَّهَ مِن قَبۡلُ لَا یُوَلُّونَ ٱلۡأَدۡبَـٰرَۚ وَكَانَ عَهۡدُ ٱللَّهِ مَسۡـُٔولࣰا
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.
— Mohammed Marmaduke William Pickthall
Wa laqad kaanoo 'aahadul laaha min qablu laa yuwal loonal adbaar; wa kaana 'ahdul laahi mas'oolaa