This surah is generally classified as Medinan, revealed during a time when the Muslim community was established but facing internal spiritual fatigue. It addresses the need for sincere faith and warns against the stagnation that affected prior religious communities.
This verse is critical because it identifies the "failure" of the previous peoples as a psychological and spiritual hardening, rather than a textual deletion.
Surah 57:16:
Is not the time ripe for those who believe, that their hearts should submit to Allah's reminder and to the truth which is revealed, and that they become not as those who received the scripture of old but the term was prolonged for them and so their hearts were hardened, and many of them are evil-livers.
The verse explicitly states why the People of the Book went astray: a "long period" passed and their hearts hardened.
If the Bible was "corrupted" by changing the words, God would have said, "Their books were altered." Instead, He says their hearts were hardened.
A hard heart does not follow the law, but the law remains. A hard heart ignores the truth, but the truth remains "revealed."
This verse identifies the 7th-century Jews and Christians as people who possess the Truth but are simply too hard-hearted to submit to it. This validates the integrity of the Bible they held.
The verse warns Muslims: "Do not become like them."
If the "People of the Book" had successfully changed their scriptures to hide the truth, the warning to Muslims should have been: "Guard your manuscripts so you don't lose the words."
Instead, the warning is: "Keep your hearts humble."
This implies the danger isn't losing the text, but losing the connection to the text. By comparing Muslims to the People of the Book, the Quran assumes they are both in the same boat—possessing a true Book but risking a hardened heart.
The verse calls both groups to submit to "what came down of the truth" (mā nazala mina l-ḥaqq).
You cannot submit to "Truth" if that Truth has been deleted or replaced by a lie.
For the People of the Book to be rebuked for not submitting to the "Truth," that Truth must still be present and available for them to submit to. If it's still present, then the Bible they held in the 7th century is that "Truth."
Surah 57:16 warns Muslims not to be like the People of the Book whose 'hearts hardened' after a long time.
Your own Book says the problem with the Christians and Jews was their hearts, not their manuscripts.
You claim the Bible is 'corrupted,' but God says we were just 'hard-hearted.' You don't need to change the words of a Book to be a 'defiantly disobedient' person; you just have to stop obeying what is written.
If the 'Truth' was gone, God wouldn't rebuke us for not submitting to it. He rebukes us because the Truth (the Bible) is right there, but our hearts are too hard to follow it.
Either the Bible remained the 'Truth' (making Islam’s claim of textual corruption false), or God is rebuking us for not submitting to a 'Truth' that you claim doesn't exist anymore. Why does the Quran blame our hearts if you want to blame our ink?"
This verse shows that "corruption" (Tahrif) in the Quran refers to Tahrif al-Ma'na (corruption of the meaning/interpretation) caused by a hard heart, rather than Tahrif al-Lafz (corruption of the text).