﴿ وَفِى مُوسَىٰٓ إِذْ أَرْسَلْنَٰهُ إِلَىٰ فِرْعَوْنَ بِسُلْطَٰنٍۢ مُّبِينٍۢ ﴾

“AND IN [the story of Pharaoh and] Moses, too, [We left the same message: for] when We sent him unto Pharaoh with [Our] manifest authority,”

The Pharaoh of Egypt called the miracles of Moses magical feats. He interpreted Moses’s firm belief (which indicated the latter’s being on the right path) as madness. This is known as covering up (talbis) and this covering up has always been the way of those people who are not ready to accept the Truth, in spite of its being supported by sound reasoning.