وَلَقَدْ كَانُوا عَاهَدُوا اللَّهَ مِن قَبْلُ لَا يُوَلُّونَ الْأَدْبَارَ وَكَانَ عَهْدُ اللَّهِ مَسْؤُولًا
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سورة الأحزاب
(33/15) And arruredly they had already covenanted with Allah that they would not turn their backs; verily the covenant with Allah must be questioned about.
Surah Al-Ahzab