'Unclean' in the Bible

These searched [for their names] among those registered in the genealogies, but they were not found; so they were excluded from the priesthood as [ceremonially] unclean.

which You have commanded by Your servants the prophets, saying, ‘The land which you are entering to possess is a defiled land with the uncleanness of the peoples of the lands, through their repulsive acts which have filled it from one end to the other along with their impurity.