A copy of an epistle, which Jeremy sent to them which were to be led captives into Babylon by the king of the Babylonians, to certify them, as it was commanded him of God.
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Olympiodorus of Alexandria
Instructed by the Spirit that the Jews would be deported, the prophet is commanded by God to write the letter even before the deportation, so that when the time of their imprisonment had arrived, it would be a protection for them so that they would not let themselves be deceived or worship the idols of the Babylonians. - "Fragments on the Letter of Jeremiah"