Al-Qasas 28:15 ودخل المدينة على حين غفلة من اهلها فوجد فيها رجلين يقتتلان هاذا من شيعته وهاذا من عدوه فاستغاثه الذي من شيعته على الذي من عدوه فوكزه موسى فقضى عليه قال هاذا من عمل الشيطان انه عدو مضل مبين ١٥

Once he entered the city at a time when its people were heedless; so he found in it two men fighting each other: This one was from his own group, and that one from his enemies. So the one from his own group called him for help against the one who was from his enemies. So Mūsā gave him a blow with his fist and finished him off. (Then) He (Mūsā) said (out of remorse), “This is some of Satan’s act. He is indeed a clear enemy who misleads (people).”