Why Would God Allow Scripture to Be Corrupted?

Quran

فَوَيْلٌۭ لِّلَّذِينَ يَكْتُبُونَ ٱلْكِتَٰبَ بِأَيْدِيهِمْ ثُمَّ يَقُولُونَ هَٰذَا مِنْ عِندِ ٱللَّهِ لِيَشْتَرُوا۟ بِهِۦ ثَمَنًۭا قَلِيلًۭا ۖ فَوَيْلٌۭ لَّهُم مِّمَّا كَتَبَتْ أَيْدِيهِمْ وَوَيْلٌۭ لَّهُم مِّمَّا يَكْسِبُونَ

سورة البقرة · الآية ٧٩

So woe to those who write the "scripture" with their own hands, then say, "This is from Allah," in order to exchange it for a small price. Woe to them for what their hands have written and woe to them for what they earn.

Quran

إِنَّآ أَنزَلْنَا ٱلتَّوْرَىٰةَ فِيهَا هُدًۭى وَنُورٌۭ ۚ يَحْكُمُ بِهَا ٱلنَّبِيُّونَ ٱلَّذِينَ أَسْلَمُوا۟ لِلَّذِينَ هَادُوا۟ وَٱلرَّبَّٰنِيُّونَ وَٱلْأَحْبَارُ بِمَا ٱسْتُحْفِظُوا۟ مِن كِتَٰبِ ٱللَّهِ وَكَانُوا۟ عَلَيْهِ شُهَدَآءَ ۚ فَلَا تَخْشَوُا۟ ٱلنَّاسَ وَٱخْشَوْنِ وَلَا تَشْتَرُوا۟ بِـَٔايَٰتِى ثَمَنًۭا قَلِيلًۭا ۚ وَمَن لَّمْ يَحْكُم بِمَآ أَنزَلَ ٱللَّهُ فَأُو۟لَٰٓئِكَ هُمُ ٱلْكَٰفِرُونَ

سورة المائدة · الآية ٤٤

Indeed, We sent down the Torah, in which was guidance and light. The prophets who submitted [to Allah] judged by it for the Jews, as did the rabbis and scholars by that with which they were entrusted of the Scripture of Allah, and they were witnesses thereto. So do not fear the people but fear Me, and do not exchange My verses for a small price. And whoever does not judge by what Allah has revealed - then it is those who are the disbelievers.

Quran

أَفَلَا يَتَدَبَّرُونَ ٱلْقُرْءَانَ ۚ وَلَوْ كَانَ مِنْ عِندِ غَيْرِ ٱللَّهِ لَوَجَدُوا۟ فِيهِ ٱخْتِلَٰفًۭا كَثِيرًۭا

سورة النساء · الآية ٨٢

Then do they not reflect upon the Qur'an? If it had been from [any] other than Allah, they would have found within it much contradiction.

Quran

إِنَّا نَحْنُ نَزَّلْنَا ٱلذِّكْرَ وَإِنَّا لَهُۥ لَحَٰفِظُونَ

سورة الحجر · الآية ٩

Indeed, it is We who sent down the Qur'an and indeed, We will be its guardian.