Sura al-Fatḥ 48:22

وَلَوْ قَٰتَلَكُمُ ٱلَّذِينَ كَفَرُوا۟ لَوَلَّوُا۟ ٱلْأَدْبَٰرَ ثُمَّ لَا يَجِدُونَ وَلِيًّا وَلَا نَصِيرًا

wa-law qātalakumu lladhīna kafarū la-wallawu l-adbāra thumma lā yajidūna waliyyan wa-lā naṣīran

If the Unbelievers should fight you, they would certainly turn their backs; then would they find neither protector nor helper.