Deuteronomy 34:5-8

So Moses the servant of Jehovah died there in the land of Moab, according to the word of Jehovah. 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. And Moses was a hundred and twenty years old when he died: his eye was not dim, nor his natural force abated. And the children of Israel wept for Moses in the plains of Moab thirty days: so the days of weeping in the mourning for Moses were ended.