This presents the question, when was the Bible altered or corrupted? It could not have occurred after the time of Muhammad as there is much evidence that the Bible is materially the same now as it was then. If it was before the time of Muhammad, Muslims have problems with their own scriptures for the Qur'an says: "The Word of thy Lord doth find its fulfilment in truth and in justice: none can change His Words: for He is the one Who heareth and knoweth all." (Surah 6:116)
Elsewhere it states, "For them are Glad Tidings, in the life of the Present and in the Hereafter: no change can there be in the Words of Allah. This is indeed the supreme Felicity." (Surah 10:64)
Please read our article on similar subject, "The Bible is changed - Really" on this site here.