Vidqun
Jeremiah prophesied that “these nations [including the Judahites] will have to serve the king of Babylon for seventy years” (Jer. 25:11). The seventy years could be viewed as a full generation (cf. Jer. 27:7). Included in the seventy years is the desolation of the land, paying off its sabbaths (2 Chron. 36:21). The desolation did not last seventy years but fulfilled seventy years [until their seventy year servitude had been completed]. In Zechariah’s case, the cities had been denounced for seventy years, i.e., they had lost God’s protection (cf. Zech. 1:12).
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The 70 years was a definite historic period as the Exile and lasted for that exact period of time right to the very month and day as shown by the Chronicler..
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According to Dan. 9:2 Jerusalem's devastation amounted to seventy years. Daniel would have known Jerusalem was not devastated for seventy years. The MT is corrupted in this instance. This was first century Jewish though on the matter. The concept, seventy years of desolation for Jerusalem, reflects later Rabbinic interpretation (see Dan. 9:2 Theo and Josephus). Devastations vs. reproach. In the OG we have ὀνειδισμός, meaning “reproach” (singular). See NETS. This is viewed as an error in the transmission: Jer. 25:9 καὶ εἰς ὀνειδισμόν and (I turn them) into a disgrace ולחרפות is read for MT and (I will turn them) into desolations. However, as seen, Dan. 9:2 is not drawn from Jer. 29:10, but Jer. 25:9-12. Here it could mean “reproach, disgrace, insult” (cf. Jer. 18:16; 19:8; Ezek. 5:13, 14). Specifically Jer. 25:9, and something to whistle at and places devastated to time indefinite.” LXX καὶ εἰς ὀνειδισμόν. See BHS footnote. KBLex, in accordance with the textcritical note suggests an emendation to (“as a disgrace”). See J. Lust, E. Eynikel & K. Hauspie (2003). A Greek-English Lexicon of the Septuagint: Revised Edition. Deutsche Bibelgesellschaft: Stuttgart. According to secular chronology, Jerusalem did not lie desolate for seventy years, but her reproach and humiliation could have started with Jehoiakim’s three year Babylonian servitude, completing Jeremiah’s seventy year cycle (2 Kings 24:1, 2; cf. Is. 25:9, 11). See also Dan. 9:16.
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Daniel recognized that the 70 years was a definite period of time countable not just to the very year but to its month as shown by the expression "for fulfilling the devastations of Jerusalem, seventy years"-NWT, 1984.
According to the Bible not secular chronology, the land lay desolate for the precise period of 70 years along with the Jews being exiled in Babylon along with reproach and humiliation as an act of punishment by God.
scholar JW