acceptable year of the Lord
Observe that Jesus suspended the reading of this passage in the synagogue at Nazareth (Luke 4:16-21) at the comma in the middle of (Isaiah 61:2). The first advent, therefore, opened the day of grace, "the acceptable year of Jehovah," but does not fulfil the day of vengeance. That will be taken up when Messiah returns (2 Thessalonians 1:7-10).
Compare (Isaiah 34:8); (Isaiah 35:4-10).
The last verse (Isaiah 61:11), taken with the 4th (Isaiah 61:4), gives the historic connection: the vengeance precedes the regathering of Israel, and synchronizes with the day of the Lord. (Isaiah 2:10-22); (Revelation 19:11-21); (Isaiah 63:1-6).