Daniel 9:2 KJV
In the first year of his reign I Daniel understood by books the number of the years, whereof the word of the Lord came to Jeremiah the prophet, that he would accomplish seventy years in the desolations of Jerusalem.

Daniel 9:21-23 KJV
Yea, whiles I was speaking in prayer, even the man Gabriel, whom I had seen in the vision at the beginning, being caused to fly swiftly, touched me about the time of the evening oblation.

[22] And he informed me , and talked with me, and said, O Daniel, I am now come forth to give thee skill and understanding.

[23] At the beginning of thy supplications the commandment came forth, and I am come to shew thee ; for thou art greatly beloved: therefore understand the matter, and consider the vision.

Daniel 9:24 KJV
Seventy weeks are determined upon thy people and upon thy holy city, to finish the transgression, and to make an end of sins, and to make reconciliation for iniquity, and to bring in everlasting righteousness, and to seal up the vision and prophecy, and to anoint the most Holy.