وَلَقَدۡ كَانُواْ عَٰهَدُواْ ٱللَّهَ مِن قَبۡلُ لَا يُوَلُّونَ ٱلۡأَدۡبَٰرَۚ وَكَانَ عَهۡدُ ٱللَّهِ مَسۡـُٔولٗا
Wa laqad kaanoo 'aahadul laaha min qablu laa yuwal loonal adbaar; wa kaana 'ahdul laahi mas'oolaa
English Translation
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
— Saheeh International