'Therein' in the Bible

Therefore shall the land mourn, and every one that dwelleth therein shall languish, with the beasts of the field and the birds of the heavens; yea, the fishes of the sea also shall be taken away.

Who is wise, that he may understand these things? prudent, that he may know them? for the ways of Jehovah are right, and the just shall walk in them; but transgressors shall fall therein.