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Lit., "at a time of its people's unawareness".
I.e., of the Hebrews.
Regarding the reference to "Satan's doing", see first half of note [16] on 15:17 . In the present instance, verses {16-17} seem to indicate that it was the Israelite, and not the Egyptian, who had been in the wrong (cf. next note). Apparently, Moses had come to the assistance of the Israelite out of an instinctive sense of racial kinship without regard to the rights and wrongs of the case; but immediately afterwards he realized that he had committed a grave sin not only by killing, however inadvertently, an innocent person, but also by basing his action on a mere tribal - or, as we would describe it today, racial or national-prejudice. Evidently, this is the purport of the above Qur'anic segment of the story of Moses. Its moral has been stressed and explained by the Prophet on many occasions: cf. his famous saying, "He is not of us who proclaims the cause of tribal partisanship ('asabiyyah); and he is not of us who fights in the cause of tribal partisanship; and he is not of us who dies in the cause of tribal partisanship" (Abu Da'ud, on the authority of Jubayr ibn Mut'im). When he was asked to explain the meaning of "tribal partisanship", the Prophet answered, "It means helping thine own people in an unjust cause" (ibid., on authority of Wathilah ibn al-Aqsa').
In his adulthood, Moses and Pharaoh’s people were not on good terms because he started to question their evil practices.
That may have been either the time of the noontime siesta, when all business is suspended even now in Egypt, or the time of night, when people are usually asleep. The latter is more probable, in view of verse 18 below. But there is also another suggestion. A guest in a Palace is not free to wander about at will in the plebeian quarters of the City at all sorts of hours, and this applies even more to an inmate of the Palace brought up as a son. Moses was therefore visiting the City privately and eluding the guards. His object may have been to see for himself how things were going on; perhaps he had heard that his people were being oppressed, as we may suppose that he had retained contact with his mother.
His object was apparently to strike him so as to release the Israelite, not to kill the Egyptian, In fact he killed the Egyptian. This was unfortunate in more ways than one. His visit to the City was clandestine; he had taken the side of the weaker and despised party; and he had taken the life of an Egyptian. He was full of regrets and repentance, and he prayed to Allah, and obtained Allah's forgiveness.