Deuteronomy 34:6

And he, the Lord, buried him in a valley in the land of Moab, over against Beth-peor, in some mountain valley not far from Nebo; but no man knoweth of his sepulcher unto this day, its exact location was not revealed. From the letter of Jude, we know that the archangel Michael contended with the devil for the body of Moses. Thus God, through His angel, saved the body of Moses from the last consequence of death under the control of Satan, from corruption. The body of Moses was taken to heaven after his burial and there changed to a spiritual body. Thus it was possible for Moses to appear with Elijah at the transfiguration of Christ. This fact gives us a strong guarantee for the final fulfillment of our hope, of the resurrection of the body.