[قَالَ لَهُ ۥ مُوسَىٰٓ إِنَّكَ لَغَوِىٌّ۬ مُّبِينٌ۬ ] ”Musa said to him: Verily, you are a plain misleader!”
Allaah (The Most High) said:
وَدَخَلَ ٱلۡمَدِينَةَ عَلَىٰ حِينِ غَفۡلَةٍ۬ مِّنۡ أَهۡلِهَا فَوَجَدَ فِيہَا رَجُلَيۡنِ يَقۡتَتِلَانِ هَـٰذَا مِن شِيعَتِهِۦ وَهَـٰذَا مِنۡ عَدُوِّهِۦۖ فَٱسۡتَغَـٰثَهُ ٱلَّذِى مِن شِيعَتِهِۦ عَلَى ٱلَّذِى مِنۡ عَدُوِّهِۦ فَوَكَزَهُ ۥ مُوسَىٰ فَقَضَىٰ عَلَيۡهِۖ قَالَ هَـٰذَا مِنۡ عَمَلِ ٱلشَّيۡطَـٰنِۖ إِنَّهُ ۥ عَدُوٌّ۬ مُّضِلٌّ۬ مُّبِينٌ۬
قَالَ رَبِّ إِنِّى ظَلَمۡتُ نَفۡسِى فَٱغۡفِرۡ لِى فَغَفَرَ لَهُ ۥۤۚ إِنَّهُ ۥ هُوَ ٱلۡغَفُورُ ٱلرَّحِيمُ
قَالَ رَبِّ بِمَآ أَنۡعَمۡتَ عَلَىَّ فَلَنۡ أَكُونَ ظَهِيرً۬ا لِّلۡمُجۡرِمِينَ
فَأَصۡبَحَ فِى ٱلۡمَدِينَةِ خَآٮِٕفً۬ا يَتَرَقَّبُ فَإِذَا ٱلَّذِى ٱسۡتَنصَرَهُ ۥ بِٱلۡأَمۡسِ يَسۡتَصۡرِخُهُ ۥۚ قَالَ لَهُ ۥ مُوسَىٰٓ إِنَّكَ لَغَوِىٌّ۬ مُّبِينٌ۬
And he (Musa) entered the city at a time of unawareness of its people, and he found there two men fighting, – one of his party (his religion – from the Children of Israel), and the other of his foes. The man of his (own) party asked him for help against his foe, so Musa (Moses) struck him with his fist and killed him. He said: “This is of Shaitan‘s (Satan) doing, verily, he is a plain misleading enemy.”
He said: “My Lord! Verily, I have wronged myself, so forgive me.” Then He forgave him. Verily, He is the Oft-Forgiving, the Most Merciful.
He said: “My Lord! For that with which You have favoured me, I will never more be a helper for the Mujrimun (criminals, disobedient to Allah, polytheists, sinners, etc.)!”
So he became afraid, looking about in the city (waiting as to what will be the result of his crime of killing), when behold, the man who had sought his help the day before, called for his help (again). Musa (Moses) said to him: “Verily, you are a plain misleader!” [1]
Imaam Ibnul Jawzi (rahimahullaah) said that one of the meanings of this statement [إِنَّكَ لَغَوِىٌّ۬ مُّبِينٌ] ”Verily, you are a plain misleader” is: You are misled in fighting a person whom you are unable to repel his evil from yourself. [2]
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[1] Surah Al-Qasas. Aayaat 15-18
[2] Zaadul Maseer Fee Ilmil Tafseer