Allaah  (The Most High) said: [وَقَالَ فِرْعَوْنُ] ”Fir’aun (Pharaoh) said’’ with haughtiness and tyranny, whilst deluding his foolish people; [ذَرُونِي أَقْتُلْ مُوسَىٰ وَلْيَدْعُ رَبَّهُ ] ‘’Leave me to kill Musa (Moses), and let him call his Lord (to stop me from killing him)!’’ [Soorah Ghafir: Ayah 26]

It was his claim that had it not been for his consideration of the wishes of his people, he would have killed Musa, and (Musa’s) supplication to his Lord would not have prevented him from that. He then mentioned what made him want to kill Musa and that he is a sincere adviser to his people, and that he wished to remove mischief from the land.  Allaah (The Most High) said that he said:

[إِنِّي أَخَافُ أَنْ يُبَدِّلَ دِينَكُمْ أَوْ أَنْ يُظْهِرَ فِي الْأَرْضِ الْفَسَادَ] ‘’I fear that he (Musa) may change your religion, or that he may cause mischief to appear in the land!” [Soorah Ghaafir: Ayah 26]

This is the most amazing the affair can be! The evilest one among the creation gives advice to the people against the best among the creation. This is disguised falsehood and propaganda, which cannot seize except the intellects of those (people) about whom Allaah stated: [فَاسْتَخَفَّ قَوْمَهُ فَأَطَاعُوهُ ۚ إِنَّهُمْ كَانُوا قَوْمًا فَاسِقِينَ] ”Thus he [Fir’aun (Pharaoh)] befooled and misled his people, and they obeyed him. Verily, they were ever a people who were Fasiqun (rebellious, disobedient to Allah).’’[Soorah Az-Zukhruf: Ayah 54]

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[Source: Abridged. See: Tayseer Al-Kareem Ar-Rahmaan Fee Tafseer Kalaam Al-Mannaan of Imaam as-Saa’di (rahimahullaah)