Surah Al-Ahzab, Verse 15

وَلَقَدۡ كَانُواْ عَٰهَدُواْ ٱللَّهَ مِن قَبۡلُ لَا يُوَلُّونَ ٱلۡأَدۡبَٰرَۚ وَكَانَ عَهۡدُ ٱللَّهِ مَسۡـُٔولٗا١٥

walaqad kānū ʿāhadū l-laha min qablu lā yuwallūna l-adbāra wakāna ʿahdu l-lahi masūlan

And they had already promised Allāh before not to turn their backs [i.e., flee]. And ever is the promise to Allāh [that about which one will be] questioned.