Jeremiah 25:11
9 So I, the Lord, affirm that I will send for all the peoples of the north and my servant, King Nebuchadnezzar of Babylon. I will bring them against this land and its inhabitants and all the nations that surround it. I will utterly destroy the land, its inhabitants, and all the surrounding nations and make them everlasting ruins. I will make them objects of horror and hissing scorn. 10 I will put an end to the sounds of joy and gladness and the glad celebration of brides and grooms in these lands. I will put an end to the sound of people grinding meal. I will put an end to lamps shining in their houses. 11 This whole area will become a desolate wasteland. These nations will be subject to the king of Babylon for 70 years.’ 12 “‘But when the seventy years are over, I will punish the king of Babylon and his nation for their sins. I will make the land of Babylon an everlasting ruin. I, the Lord, affirm it! 13 I will bring on that land everything that I said I would. I will bring on it everything that is written in this book. I will bring on it everything that Jeremiah has prophesied against all the nations.
Zechariah 7:5
3 by asking both the priests of the temple of the Lord of Heaven’s Armies and the prophets, “Should we weep in the fifth month, fasting as we have done over the years?” 4 The message of the Lord of Heaven’s Armies then came to me, 5 “Speak to all the people and priests of the land as follows: ‘When you fasted and lamented in the fifth and seventh months through all these 70 years, did you truly fast for me—for me, indeed? 6 And now when you eat and drink, are you not doing so for yourselves? 7 Should you not have obeyed the words that the Lord cried out through the former prophets when Jerusalem was peacefully inhabited and her surrounding cities, the Negev, and the foothills were also populated?’”
Notes and References
"... Several writings in the Hebrew Bible also show an interest in the number seventy for the structuring of time. Well known is the reference in Jeremiah to “seventy years” as the period of duration for the Babylonian exile (Jeremiah 25:11–12; 29:10). Similarly, in Zechariah 1:12–17 a duration of seventy years is applied to the Temple’s ruined state (compare also Zechariah 7:5), with the text adding that after this the Temple will be rebuilt (Zechariah 1:16). Seventy years are also mentioned in 2 Chronicles 36:21, though there they are referred to as “seventy years of rest” in the land. Thus the Jeremianic prophecy that focuses on the exile from the land and the Chronicler’s emphasis on rest in the land stand at odds ..."
Stuckenbruck, Loren T. "The Apocalypse of Weeks: Periodization and Tradition-Historical Context" in Perrin, Andrew B., and Loren T. Stuckenbruck (eds.) Four Kingdom Motifs before and beyond the Book of Daniel (pp. 81-95) Brill, 2021