Assalamualaikum warahmatullahi wabarakatuh
Allâh Almighty has given us a promise in the Holy Qur’ân:
Indeed We have revealed the Zikr (ie. the Qur’ân) and surely We will preserve it. (15:9)
In this verse, Allâh Almighty has assured the preservation of the Holy Qur’ân. This implies that the Qur’ân will remain uninterpolated and that it shall always be transferred from one generation to the other in its real and original form, undistorted by any foreign element. The question now is whether this divine protection is restricted only to the words of the Holy Qur’ân or does it extend to its real meanings as well. If the prophetic explanation is necessary to understand the Holy Qur’ân correctly, as proved in the first chapter, then the preservation of the Qur’ânic words alone cannot serve the purpose unless the prophetic explanations are also preserved. As quoted earlier, the Holy Book says,
We have revealed to you the Zikr (Qur’ân) so that you may explain to the people what has been sent down for them.
The word “Zikr” has been used here for the Holy Qur’ân as has been used in the verse 15:9 and it has been made clear that the people can only benefit from its guidance when they are led by the explanations of the Holy Prophet (Sallallaho Alaihe Wassallam).
Again, the words “for the people” indicate (especially in the original Arabic context), that the Holy Prophet’s (Sallallaho Alaihe Wassallam) explanation is always needed by “everyone.”
Now, if everyone, in every age is in need of the prophetic explanation, without which they cannot fully benefit from the Holy Book, how would it be useful for them to preserve the Qur’ânic text and leave its prophetic explanation at the mercy of distorters, extending to it no type of protection whatsoever.
Therefore, once the necessity of the prophetic explanations of the Holy Qur’ân is accepted, it will be self-contradictory to claim that these explanations are unavailable today. It will amount to negating the divine wisdom, because it is in no way a wise policy to establish the necessity of the sunnah on the one hand and to make its discovery impossible on the other. Such a policy cannot be attributed to Allâh, the All-Mighty, the All-Wise.
This deductive argument is, in my view, sufficient to establish that comprehending the sunnah of the Holy Prophet (Sallallaho Alaihe Wassallam), which is necessary for the correct understanding of the divine guidance, shall as a whole remain available in a reliable manner forever
https://www.central-mosque.com/fiqh/asunnah1.htm
The explanation above was basically to show that not only do the Muslims have the uninterpolated Quran preserved to this day, but they also have its interpretation, so this means THE ENTIRE Islam is amongst the Muslims in its correct form and Allah will protect it
Wassalam