Muslims believe in all books that God has sent down to humanity through His prophets. These books include the Books of Abraham, the Torah of Moses, the Psalms of David, and the Gospel of Jesus Christ. These books all had the same source (God), the same message, and all were revealed in truth. This does not mean that they have been preserved in truth. Muslims (and many other Jewish and Christian scholars and historians) find that the books in existence today are not the original scriptures, which in fact have been lost, changed, and / or translated over and over again, losing the original message.