﴿ وَمَا قَدَرُوا۟ ٱللَّهَ حَقَّ قَدْرِهِۦٓ إِذْ قَالُوا۟ مَآ أَنزَلَ ٱللَّهُ عَلَىٰ بَشَرٍۢ مِّن شَىْءٍۢ ۗ قُلْ مَنْ أَنزَلَ ٱلْكِتَٰبَ ٱلَّذِى جَآءَ بِهِۦ مُوسَىٰ نُورًۭا وَهُدًۭى لِّلنَّاسِ ۖ تَجْعَلُونَهُۥ قَرَاطِيسَ تُبْدُونَهَا وَتُخْفُونَ كَثِيرًۭا ۖ وَعُلِّمْتُم مَّا لَمْ تَعْلَمُوٓا۟ أَنتُمْ وَلَآ ءَابَآؤُكُمْ ۖ قُلِ ٱللَّهُ ۖ ثُمَّ ذَرْهُمْ فِى خَوْضِهِمْ يَلْعَبُونَ ﴾

“For, no true understanding of God have they when they say, "Never has God revealed anything unto man." Say: "Who has bestowed from on high the divine writ which Moses brought unto men as a light and a guidance, [and] which you treat as [mere] leaves of paper, making a show of them the while you conceal [so] much - although you have been taught [by it] what neither you nor your forefathers had ever known?" Say: "God [has revealed that divine writ]!" - and then leave them to play at their vain talk.”

Please check ayah 6:92 for complete tafsir.