The Babylonian Captivity
The Jews had a hard life in the Babylonian captivity, but the Lord did not abandon His chosen people in exile. So as to arouse repentance in the Jews and comfort them, the Lord sent to them His prophets during the captivity. The Prophet Ezekiel and the Prophet Daniel were particularly remarkable during this period.
(from: The Law of God by Fr. Seraphim Slobodskoy)