It's a matter of the validity of human witnessing, and being canonized by a known authority.
The OT stands as a multiple account witnessing. It's crucial that in Jewish custom single person witnessing doesn't count. That's why even Jesus has to put that under the circumstance that in the absence of valid human witnessing, God (the Holy Trinity) will be His valid witnessing. God the father and God the Holy Spirit will be His witnesses. That is to say, under normal circumstance a witnessing is considered valid only when more than one humans stand as witnesses.
The OT is about how the chosen witnesses of God, that is the prophets, stood witnessing for Him in the various times of the Jewish history. This serves the purpose that by the multiple witnessing of chosen humans and mostly through the Jews, God made Himself known to today's humans, Jews and gentiles alike.
This witnessing of multiple human accounts is also canonized, maintained by a human authority designated by God. Such that this human authority will guard the Scripture from any human will to make changes onto it. This is so such that it is verifiable that what God said about human salvation 2000 years ago, will remain the same message of salvation today. It is verifiable that God will not say one thing 2000 years ago and another 2000 years later to humans in regards to the salvation He provided.
As a result, today we can tell that the OT we read today is the same OT the Jews read 2000 years ago. Humans (by the will of God) have a whole library of scrolls (Dead Sea Scrolls) for us to reconcile that the OT remains unchanged theologically speaking.
As for NT, we can tell the same as (again by the will of God) humans have two independent sources of Bible manuscripts, namely, the NIV and KJV versions of the NT Bible. The are theological identical for today's human to tell that God said about the same salvation to humans 2000 years ago, He says the same to today's humans.
In comparison, Islam is a joke, a copycat and a fake!
2000 years ago, the Sanhedrin (thus the Jews) is the only authority for the legitimate publishing and distribution of OT Scripture. The Jews are the guardian of the Word of God. It is them who had canonized the OT legitimately.
The Catholics then picked up the role ever since the Jews failed. They canonized and maintained the NT Bible correctly. God on the other hand, only allow the Protestants to have (and thus be the guardian) both the OT and NT canon correct.
God's earthly apostle's Church also acts as the authority of the various translations of the Bible, especially from the perspective of the salvation message embedded. All churches deemed to be apostle's Church can be identified by the common standard of faith called the Apostle's Creed.
That's how serious God is in regards to the Bible He inspired.
Again in comparison, Islam is a joke, a lame copycat and a fake!
Moses mentioned Jesus because Moses is to fore-shadow Jesus in terms of human salvation. And the parallel is,
Moses, one of the greatest prophets of God, led the Jews out of Egypt to free them from being enslaved, and to bring them to the promised land of Canaan.
Jesus, the greatest prophet of God, will lead humans out of Hades/hell to free them from being enslaved, and to bring them to the promised land of Heaven (New Earth and New Heaven).
In comparison, Islam is a joke, a lame copycat and a fake!
