It seems certain Quranic verses confirm the authenticity of the Torah and Gospel during Mohammed’s time:
“So if you are in doubt, [O Muhammad], about that which We have revealed to you, then ask those who have been reading the Scripture before you. The truth has certainly come to you from your Lord, so never be among the doubters.” – Sura 10:94
God does not warn Mohammed to exercise caution when asking the people who have read the scripture because their scripture is partly corrupt. It is highly dangerous to consult people with a corrupt scripture in dealing with divine truth.
“And let the People of the Gospel judge by what Allah has revealed therein. And whoever does not judge by what Allah has revealed - then it is those who are the defiantly disobedient.” – Sura 5:47
How could God charge the people of the Gospel to judge if their Gospel is corrupt?
“But when the truth came to them from Us, they said, "Why was he not given like that which was given to Moses?" Did they not disbelieve in that which was given to Moses before? They said, "[They are but] two works of magic supporting each other, and indeed we are, in both, disbelievers. And whoever does not judge by what Allah has revealed - then it is those who are the defiantly disobedient. Say, Then bring a scripture from Allah which is more guiding than either of them that I may follow it, if you should be truthful." – Sura 28:48-49
Mohammed challenges disbelievers to bring a scripture more guiding than the Quran and the Torah, why would Mohammed propose this challenge if the Torah was corrupt?
I am curious to know the Islamic position on this. I invite Muslims to please answer these questions.