Deuteronomy 34:5-8

So Moses the servant of the LORD died there in the land of Moab, according to the word of the LORD. And He buried him in a valley in the land of Moab, opposite Beth Peor; but no one knows his grave to this day. Moses was one hundred and twenty years old when he died. His eyes were not dim nor his natural vigor diminished. And the children of Israel wept for Moses in the plains of Moab thirty days. So the days of weeping and mourning for Moses ended.