وَلَقَدْ كَانُوا عَاهَدُوا اللَّهَ مِن قَبْلُ لَا يُوَلُّونَ الْأَدْبَارَ وَكَانَ عَهْدُ اللَّهِ مَسْؤُولًا
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سورة الأحزاب
(33/15) And certainly they had made a covenant with Allah before not to turn their backs and flee. And a covenant with Allah is a responsibility.
Surah Al-Ahzab