And he entered the city at a time of inattention by its (28:15)

Almuntakhab Fi Tafsir Alquran Alkarim

He entered the city unnoted by its people (who might have retired for the siesta or the night) only to find two men fighting, one of the same law and the other of his foes-an Egyptian: His co-religionist sought his help against their enemy and there Mussa cuffed him with the fists and the man dropped dead. There and then said Mussa: This is indeed a Satanic incitement, for this is the work of AL-Shaytan (Satan) who is an avowed enemy instigating deviation from the path of righteousness

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(28:15) (One day) he entered the city at a time when the people were heedless. *20 There he saw two men fighting, the one of his own people, the other of his enemies. The one belonging to his own people asked his help against the one belonging to the enemy. Moses gave him a blow *21 and killed him. (On seeing what had happened) Moses said, "This is the work of Satan: he is a deadly enemy (of man) and an open misleader." *22

And he entered the city at a time of inattention by its meaning

*20) It might be the early morning, or midday in summer, or night in winter, when the roads were deserted and there was all quiet in the city. The words "entered the city" indicate that the royal palaces were situated outside the capital, away from the common population. The words used are "entered the city" and not "came out in the city", because the Prophet Moses lived in the royal palace.
*21) The word wakaza in the original means both giving a slap and giving a blow. We have adopted "Moses gave a blow" for the reason that a blow can cause death but not so a slap.
*22) One can imagine the state of utter remorse and confusion in which the Prophet Moses uttered these words when he saw the Egyptian fall down after receiving the blow and breathe his last. He had no intention to murder, nor is a blow struck to kill, nor can one expect that a healthy person would die on receiving a blow. That is why the Prophet Moses exclaimed: "This is the work of Satan! He has made me do this in order to work some great mischief, so that I am accused of killing an Egyptian while defending an Israelite, and a violent storm of 'anger and indignation is aroused in the whole of Egypt not only against me but the whole Israelite community." In this connection, the Bible gives a different version from the Qur'an. It declares the Prophet Moses to be guilty of wilful murder. It says that when Moses saw an Egyptian and an Israelite fighting, "He ( Moses) looked this way and that way, and when he saw that there was no man, He slew the Egyptian, and hid him in the sand." (Exod. 2: 12). The same is the version of the Talmud also. Now anybody can see how the Israelites brand the characters of their elders with infamy and how the Qur'an exonerates them. The verdict of common sense also is that a wise and discreet person, who was to become a great Prophet in the future, and who had to give man a great code of law and justice, could not be such a blind nationalist that seeing a member of his own community fighting with a man of the other community he would be so infuriated that he would kill the other person wilfully. Evidently, it could not be lawful to kill the Egyptian only for the sake of rescuing an Israelite from his tyranny.
 

And he entered the city at a time of inattention by its meaning in Urdu

(ایک روز) وہ شہر میں ایسے وقت میں داخل ہوا جبکہ اہلِ شہر غفلت میں تھے وہاں اس نے دیکھا کہ دو آدمی لڑ رہے ہیں ایک اس کی اپنی قوم کا تھا اور دُوسرا اس کی دشمن قوم سے تعلق رکھتا تھا اس کی قوم کے آدمی نے دشمن قوم والے کے خلاف اسے مدد کے لیے پکارا موسیٰؑ نے اس کو ایک گھونسا مارا اور اس کا کام تمام کر دیا (یہ حرکت سرزد ہوتے ہی) موسیٰؑ نے کہا "یہ شیطان کی کارفرمائی ہے، وہ سخت دشمن اور کھلا گمراہ کن ہے"