Al-Qasas 28:19 فلما ان اراد ان يبطش بالذي هو عدو لهما قال يا موسى اتريد ان تقتلني كما قتلت نفسا بالامس ان تريد الا ان تكون جبارا في الارض وما تريد ان تكون من المصلحين ١٩

How the Secret of this Killing became known

Allah tells us that when Musa killed that Coptic,

(he became afraid in the city) meaning, of the consequences of his action,

(looking about) means, turning around and watching out, waiting for the consequences of his action