Hi FB, welcome to the Islam DIR
Generally our scholars say that whatever that's in the OT that doesn't contradict the Qur'an is from God as it was revealed to Jesus, peace be upon him and his mother.
On the other hand though, because we believe that it has been altered some parts that are in line with Islamic teachings may be from human additions which then goes back to our Prophet peace be upon him, who saw his companion having a page of the Bible in his hand and telling him that he is at risk of accepting what may be false (altered) and rejecting what may be truth (revelation) and so forbade them from reading it.
However, there are many many scholars who do read the Bible in order to understand Christianity better and not to learn/put into practice anything contained in it.