Quran 3:111 from Surah Aal-i-Imraan on Divine Marvels.
لَن يَضُرُّوكُمۡ إِلَّآ أَذٗىۖ وَإِن يُقَٰتِلُوكُمۡ يُوَلُّوكُمُ ٱلۡأَدۡبَارَ ثُمَّ لَا يُنصَرُونَ
English translation: Never will they harm you except a hurt And if they fight you they will turn (towards) you the backs then not they will be helped
Transliteration: lan yadurrukum illa adhan wa-in yuqatilukum yuwallukumu al-adbara thumma la yunsaruna