The Rebellious do not believe in Miracles

Allah says here:

﴿ أَوَلَمۡ يَڪۡفُرُواْ بِمَآ أُوتِىَ مُوسَىٰ مِن قَبۡلُ‌ۖ ﴾

(Did they not disbelieve in that which was given to Musa of old) Did not mankind disbelieve in those mighty signs which were given to Musa

﴿ قَالُواْ سِحۡرَانِ تَظَـٰهَرَا ﴾

(They say: "Two kinds of magic, each helping the other!'') cooperating or working one with the other.

﴿ وَقَالُوٓاْ إِنَّا بِكُلٍّ۬ كَـٰفِرُونَ ﴾

(And they say: "Verily, in both we are disbelievers.'') meaning, `we disbelieve in each of them.' Because of the close relationship between Musa and Harun, mention of one includes the other.