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Lit., "thou didst commit thy deed which thou hast commited" - a construction meant to express the speaker's utter condemnation of the deed referred to: hence, my interpolation of the word "heinous". As regards the above allusions to Moses' childhood and youth at Pharaoh's court, the manslaughter committed by him, and his flight from Egypt, see {28:4-22}.
See previous footnote.
Further, Pharaoh reminds Moses of his having slain the Egyptian, and taunts him: "You are not only a murderer: you are an ungrateful wretch" (using kafir again in a double sense) "to have killed one of the race that brought you up!"