'Uncleanness' in the Bible

And the sons of Israel, those returning from the captivity, and every one who is separated from the uncleanness of the nations of the land unto them, to seek to Jehovah, God of Israel, do eat,

that Thou hast commanded by the hands of thy servants the prophets, saying, The land into which ye are going to possess it, is a land of impurity, by the impurity of the people of the lands, by their abominations with which they have filled it -- from mouth unto mouth -- by their uncleanness;