Daniel 9:2

2 In the first year of his reign, I Daniel understood by books the number of the years, concerning which the word of the LORD came to Jeremiah the prophet, that he would accomplish seventy years in the desolations of Jerusalem.

Daniel 9:2 In-Context

1 In the first year of Darius the son of Ahasuerus, of the seed of the Medes, who was made king over the realm of the Chaldeans;
2 In the first year of his reign, I Daniel understood by books the number of the years, concerning which the word of the LORD came to Jeremiah the prophet, that he would accomplish seventy years in the desolations of Jerusalem.
3 And I set my face to the Lord God, to seek by prayer and supplications, with fasting, and sackcloth, and ashes:
4 And I prayed to the LORD my God, and made my confession, and said, O Lord, the great and dreadful God, keeping the covenant and mercy to them that love him, and to them that keep his commandments;
5 We have sinned, and have committed iniquity, and have done wickedly, and have rebelled, even by departing from thy precepts and from thy judgments:
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