In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Allaah [The Most High] says in Surah Ghafir Ayah 29:
[قَالَ فِرۡعَوۡنُ مَآ أُرِيكُمۡ إِلَّا مَآ أَرَىٰ وَمَآ أَهۡدِيكُمۡ إِلَّا سَبِيلَ ٱلرَّشَادِ -Fir’aun (Pharaoh) said: “I show you only that which I see (correct), and I guide you only to the path of right policy!]
He deceived his people, so that he is followed and his leadership established. Allaah [The Most High] says that he said to his people: [مَآ أُرِيكُمۡ إِلَّا مَآ أَرَىٰ – I show you only that which I see (correct)]; Yes indeed, he spoke the truth regarding the fact that he only wanted to show his people what he considered to be the right thing; but what was it that he considered to be right thing?! He wanted to conceal the truth because Moosaa [alayhis-salaam] was upon truth, and he rejected it after being certain of it.
Then Allaah [The Most High] says that he said to his people: [وَمَآ أَهۡدِيكُمۡ إِلَّا سَبِيلَ ٱلرَّشَادِ- and I guide you only to the path of right policy!]; Indeed, he lied because this claim that he only wants to guide them to what is right is tantamount to altering the reality. It would have been a lesser crime if he merely wanted them to follow his disbelief and misguidance, but the affair became worse when he commanded them to follow him and claimed that adhering to his path is the right path and that Moosaa [alayhis-salaam] was upon falsehood.
[An Excerpt from ‘Tayseer Al-kareem Ar-Rahmaan Fee Tafseer Kalaam Al-Mannaan’ by Imaam As-Sadi (rahimahullaah)]