وَلَقَدۡ كَانُواْ عَٰهَدُواْ ٱللَّهَ مِن قَبۡلُ لَا يُوَلُّونَ ٱلۡأَدۡبَٰرَۚ وَكَانَ عَهۡدُ ٱللَّهِ مَسۡـُٔولٗا
Walaqad kanoo AAahadoo Allaha min qablu la yuwalloona aladbara wakana AAahdu Allahi masoolan
And yet they had already covenanted with Allah not to turn their backs, and a covenant with Allah must (surely) be answered for.