Chapter 51:1-8 completes what chapters 49-50 and previous chapters began. By the end of verse 8, readers can conclude that the reference to the “barren” woman in 54:1 looks back to the references in God’s speech to a faithful Sion. In chapter 51, these are God’s people who follow after righteousness and seek the Lord. Consistent with many prior chapters, God again makes clear that Gentiles will be intimately woven into Israel’s future blessings of comfort and prosperity. …
Isaiah 51:9-16 LXX: Isaiah Devotional 2.36
The Septuagint text allows two possible speakers in Septuagint Isaiah 51:9-11. First, God may be addressing the people of Jerusalem, or second, the prophet Isaiah may be addressing them. Because the text switches from second person vocative (direct address) in verses 9-10 to third person in verse 11, the grammatical structure leans toward Isaiah as speaker (see also Isaiah 50:10). …