Albert Barnes Commentary Deuteronomy 34:6

"And he buried him in the valley in the land of Moab over against Beth-peor: but no man knoweth of his sepulchre unto this day." — Deuteronomy 34:6 (ASV)

No man knows of his sepulchre - It was hardly to prevent the grave of Moses from becoming an object of superstitious honor, because the Jews were not prone to this particular form of error. Bearing in mind the appearance of Moses at the Transfiguration (Matthew 17:1–10), and what is said by Jude (Jude 1:9), we may conjecture that Moses after death passed into the same state with Enoch and Elijah; and that his grave could not be found because he was shortly translated (transported) from it.