'Seventy Years' in the Bible

And the messenger of Jehovah will answer and say, O Jehovah of armies, how long wilt thou not compassionate Jerusalem and the cities of Judah with whom thou wert very angry this seventy years?

Say to all the people of the land, and to the priests, saying, When ye fasted and mourned in the fifth and in the seventh, and this seventy years, fasting, fasted ye to me, me?