The Qur’an does confirm the Bible in Surah 5:47 and 10:94 and 2:136 and 29:46 and 5:68.
“no one can change the words of God”
وَلَا مُبَدِّلَ لِكَلِمَاتِ اللَّهِ
“And there is no changing the words of Allah” (This phrase is from Surah 6:34, and see 6:115 (116); 10:64 (65); and 18:27
Since we have many older manuscripts than 600 AD, and the Qur’an confirms the Bible at the time of Muhammad, then the Qur’an never says the text of the Injeel or Torah or Zabur of Davood was changed.