This verse serves as the Quran's "ID Card," defining its relationship with the Bible NOT as a successor that replaces a corrupted text, but as a confirmation of a physically present and doubt-free revelation.
Surah 10:37:
And this Qur'an is not such as could ever be produced by other than Allah, but a confirmation of what was before it and a detailed explanation of the Scripture, about which there is no doubt, from the Lord of the worlds.
The phrase bayna yadayhi is a 7th-century idiom meaning "currently present" or "in one’s possession."
If the Quran was sent to "confirm" the Bible that the Jews and Christians had "between their hands" in 610–632 AD, it was confirming the Codex Vaticanus, Codex Sinaiticus, and the Peshitta.
Those manuscripts explicitly teach the Trinity, the Deity of Christ, and the Crucifixion. If the Quran confirms them, it confirms the doctrines that it elsewhere calls shirk (blasphemy). If those books were "corrupted," then the Quran was confirming a corruption, which would mean the Quran itself is not from Allah.
The verse says the Quran is a Tafṣīl (detailed explanation) of the Scripture.
A "detailed explanation" of a document doesn't change the fundamental story of that document. For example, if you explain a contract, you don't say the contract says the opposite of what it actually says.
The Bible says Jesus is the Son of God who died for sins. If the "detailed explanation" (the Quran) says Jesus is not the Son of God and did not die for sins, it is not an "explanation"—it is a total contradiction. A "detailed explanation" that contradicts the source text is a failed explanation.
The verse concludes by saying there is "no doubt" that this (the Quran and the Scripture it confirms) is from the Lord of the worlds.
By removing "doubt" from the previous Scripture, the Quran locks the Muslim into accepting the Bible as divine.
If a Muslim apologist tries to cast "doubt" on the Bible by calling it corrupted (tahrif), they are violating the very "no doubt" decree of Surah 10:37.
If the Quran is a 'detailed explanation' of the Book that was 'between the hands' of the 7th-century Christians, why does the 'explanation' deny the primary message of the Book it is explaining?" You are holding the Quran to its own definition of being a "Confirmation."
There is a "Verification Challenge" in Surah 10:94, where Muhammad himself is told to check with the Bible-readers.