Translation of the verse 49 from Surah Al-Qasas : Number of verses 88 - - page 391 - Part 20.
Say (to them, O Muhammad SAW): "Then bring a Book from Allah, which is a better guide than these two [the Taurat (Torah) and the Quran], that I may follow it, if you are truthful."
Say, "Then bring a scripture from Allah which is more guiding than either of them that I may follow it, if you should be truthful."
(28:49) And they said, "We believe in neither." (O Prophet,) say to them, "Well, bring a book from Allah, which may give better guidance than these two, if you are truthful I shall follow the same. " *70
*70) That is, "I have to follow the guidance in any case, provided that it is not forged but is real guidance from God. If you possess a Divine Book which gives better guidance than the Qur'an and the Torah, you should produce it: I shall follow it without any hesitation."