Surah An-Nazi'at — Ayah 19

ٱذْهَبْ إِلَىٰ فِرْعَوْنَ إِنَّهُۥ طَغَىٰ

"Go to Pharaoh. Indeed, he has transgressed.

فَقُلْ هَل لَّكَ إِلَىٰٓ أَن تَزَكَّىٰ

And say to him, 'Would you [be willing to] purify yourself

فَأَرَىٰهُ ٱلْـَٔايَةَ ٱلْكُبْرَىٰ

And he showed him the greatest sign,

فَكَذَّبَ وَعَصَىٰ

But Pharaoh denied and disobeyed.