'Seventy' in the Bible

And it hath come to pass, in that day, That forgotten is Tyre seventy years, According to the days of one king. At the end of seventy years there is to Tyre as the song of the harlot.

And it hath come to pass, At the end of seventy years Jehovah inspecteth Tyre, And she hath repented of her gift, That she committed fornication With all kingdoms of the earth on the face of the ground.