Surah Al-Qasas (The Stories), Verse 15

وَدَخَلَ الْمَدِیْنَةَ عَلٰی حِیْنِ غَفْلَةٍ مِّنْ اَهْلِهَا فَوَجَدَ فِیْهَا رَجُلَیْنِ یَقْتَتِلٰنِ هٰذَا مِنْ شِیْعَتِهٖ وَهٰذَا مِنْ عَدُوِّهٖ فَاسْتَغَاثَهُ الَّذِیْ مِنْ شِیْعَتِهٖ عَلَی الَّذِیْ مِنْ عَدُوِّهٖ فَوَكَزَهٗ مُوْسٰی فَقَضٰی عَلَیْهِ قَالَ هٰذَا مِنْ عَمَلِ الشَّیْطٰنِ اِنَّهٗ عَدُوٌّ مُّضِلٌّ مُّبِیْنٌ ۟

Wa dakhalal madeenata 'alaa heene ghaflatim min ahlihaa fawajada feeha raju laini yaqtatilaani haazaa min shee'atihee wa haaza min 'aduwwihee fastaghaasahul lazee min shee'atihee 'alal lazee min 'aduwwihee fawakazahoo Moosaa faqadaa 'alaihi qaala haaza min 'amalish Shaitaani innahoo 'aduwwum mmudillum mubeen

“And he entered the city at a time when its people were not watching: and he found there two men fighting,- one of his own religion, and the other, of his foes. Now the man of his own religion appealed to him against his foe, and Moses struck him with his fist and made an end of him. He said: "This is a work of Evil (Satan): for he is an enemy that manifestly misleads!"”

Quran 28:15 (Yusuf Ali Translation)