Cyrus Helps the Exiles to Return
1 In the first year of Cyrus king of Persia, in order to fulfill the word of the Lord spoken by Jeremiah, the Lord moved the heart of Cyrus king of Persia to make a proclamation throughout his realm and also to put it in writing:
2 “This is what Cyrus king of Persia says:
“‘The Lord , the God of heaven, has given me all the kingdoms of the earth and he has appointed me to build a temple for him at Jerusalem in Judah. 3 Any of his people among you may go up to Jerusalem in Judah and build the temple of the Lord , the God of Israel, the God who is in Jerusalem, and may their God be with them. 4 And in any locality where survivors may now be living, the people are to provide them with silver and gold, with goods and livestock, and with freewill offerings for the temple of Godin Jerusalem.’”
5 Then the family heads of Judah and Benjamin, and the priests and Levites—everyone whose heart God had moved—prepared to go up and build the house of the Lord in Jerusalem. 6 All their neighbors assisted them with articles of silver and gold, with goods and livestock, and with valuable gifts, in addition to all the freewill offerings.
The List of the Exiles Who Returned
2 Now these are the people of the province who came up from the captivity of the exiles, whom Nebuchadnezzar king of Babylon had taken captive to Babylon (they returned to Jerusalem and Judah, each to their own town, 2 in company with Zerubbabel, Joshua, Nehemiah, Seraiah, Reelaiah, Mordecai, Bilshan, Mispar, Bigvai, Rehum and Baanah):
Jeremiah's Letter to the Exiles
29 These are the words of the letter that Jeremiah the prophet sent from Jerusalem to the surviving elders of the exiles, and to the priests, the prophets, and all the people, whom Nebuchadnezzar had taken into exile from Jerusalem to Babylon. 2 This was after King Jeconiah and the queen mother, the eunuchs, the officials of Judah and Jerusalem, the craftsmen, and the metal workers had departed from Jerusalem. 3 The letter was sent by the hand of Elasah the son of Shaphan and Gemariah the son of Hilkiah, whom Zedekiah king of Judah sent to Babylon to Nebuchadnezzar king of Babylon. It said: 4 “Thus says the Lord of hosts, the God of Israel, to all the exiles whom I have sent into exile from Jerusalem to Babylon: 5 Build houses and live in them; plant gardens and eat their produce. 6 Take wives and have sons and daughters; take wives for your sons, and give your daughters in marriage, that they may bear sons and daughters; multiply there, and do not decrease. 7 But seek the welfare of the city where I have sent you into exile, andpray to the Lord on its behalf, for in its welfare you will find your welfare. 8 For thus says the Lord of hosts, the God of Israel: Do not let your prophets and your diviners who are among you deceive you, and do not listen to the dreams that they dream, [a] 9 for it is a lie that they are prophesying to you in my name; I did not send them, declares the Lord .
10 “For thus says the Lord : When seventy years are completed for Babylon, I will visit you, and I will fulfill to you my promise and bring you back to this place. 11 For I know the plans I have for you, declares the Lord , plans for welfare [b] and not for evil, to give you a future and a hope. 12 Then you will call upon me and come and pray to me, and I will hear you.
If we go by Ethos calculations Jehocian's group went into exile in 617.......10 years before Jerusalem's destruction 607, making their exile 80 years....... 
