Quran 8:16 from Surah Al-Anfaal on Divine Marvels.
وَمَن يُوَلِّهِمۡ يَوۡمَئِذٖ دُبُرَهُۥٓ إِلَّا مُتَحَرِّفٗا لِّقِتَالٍ أَوۡ مُتَحَيِّزًا إِلَىٰ فِئَةٖ فَقَدۡ بَآءَ بِغَضَبٖ مِّنَ ٱللَّهِ وَمَأۡوَىٰهُ جَهَنَّمُۖ وَبِئۡسَ ٱلۡمَصِيرُ
English translation: And whoever turns to them that day his back except (as) a strategy of war or (to) join to a group certainly (he has) incurred wrath of Allah and his abode (is) Hell a wretched destination
Transliteration: waman yuwallihim yawma-idhin duburahu illa mutaharrifan liqitalin aw mutahayyizan ila fi-atin faqad baa bighadabin mina al-lahi wamawahu jahannamu wabi'sa al-masiru