Al-An'aam 6:91

They did not revere Allah His true reverence when they said, “Allah has sent down nothing to human beings.” Say [O Prophet], “Who then sent down the Scripture that Moses brought as a light and guidance for people, but you make it into separate sheets – revealing some and concealing much, although you have been taught [this Qur’an] which neither you nor your forefathers knew?” Say, “Allah [sent it down].” Then leave them to amuse themselves in their falsehood.

And they did not appraise Allāh with true appraisal[324] when they said, "Allāh did not reveal to a human being anything." Say, "Who revealed the Scripture that Moses brought as light and guidance to the people? You [Jews] make it into pages, disclosing [some of] it and concealing much. And you[325] were taught that which you knew not - neither you nor your fathers." Say, "Allāh [revealed it]." Then leave them in their [empty] discourse, amusing themselves.

[324] i.e., they did not appreciate the extent of His ability and wisdom.
[325] The Jews, or it may refer to the believers, who are taught by the Qur’ān.

91. They (the Jews, Quraish pagans, idolaters) did not estimate Allâh with an estimation due to Him when they said: "Nothing did Allâh send down to any human being (by revelation)." Say (O Muhammad صلى الله عليه وسلم): "Who then sent down the Book which Mûsâ (Moses) brought, a light and a guidance to mankind which you (the Jews) have made into (separate) papersheets, disclosing (some of it) and concealing much. And you (believers in Allâh and His Messenger Muhammad صلى الله عليه وسلم) were taught (through the Qur’ân) that which neither you nor your fathers knew." Say: "Allâh (sent it down)." Then leave them to play in their vain discussions. (Tafsir Al-Qurtubî).

And they measure not the power of Allah its true measure when they say: Allah hath naught revealed unto a human being. Say (unto the Jews who speak thus): Who revealed the Book which Moses brought, a light and guidance for mankind, which ye have put on parchments which ye show, but ye hide much (thereof), and (by which) ye were taught that which ye knew not yourselves nor (did) your fathers (know it)? Say: Allah. Then leave them to their play of cavilling.