The Quran

فَلَمّا جاءَهُمُ الحَقُّ مِن عِندِنا قالوا لَولا أوتِيَ مِثلَ ما أوتِيَ موسىٰ ۚ أَوَلَم يَكفُروا بِما أوتِيَ موسىٰ مِن قَبلُ ۖ قالوا سِحرانِ تَظاهَرا وَقالوا إِنّا بِكُلٍّ كافِرونَ

(Saheeh International)

But when the truth came to them from Us, they said, "Why was he not given like that which was given to Moses?" Did they not disbelieve in that which was given to Moses before? They said, "[They are but] two works of magic supporting each other,¹ and indeed we are, in both, disbelievers."

The reference is by the disbelievers of Quraysh to the Qur’ān and the Torah.