Al Ahzab, 15 Ayah
33:15
وَلَقَدۡ كَانُواْ عَٰهَدُواْ ٱللَّهَ مِن قَبۡلُ لَا يُوَلُّونَ ٱلۡأَدۡبَٰرَۚ وَكَانَ عَهۡدُ ٱللَّهِ مَسۡـُٔولٗا ١٥
Wa Laqad Kānū `Āhadū Al-Laha Min Qablu Lā Yuwallūna Al-'Adbāra ۚ Wa Kāna `Ahdu Al-Lahi Mas'ūlāan
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.