Isaiah 61:9
And their seed shall be known among the Gentiles, and their offspring among the people: all that see them shall acknowledge them, that they are the seed which the Lord hath blessed.
Cross-reference
Isaiah 65:23 directly says they shall be the offspring of the blessed of the Lord, virtually identical to this verse.
In Isaiah 45:14, nations come and say 'Surely God is with you' — exactly the kind of recognition described here for the blessed offspring.
In Isaiah 62:2, nations see Israel's righteousness and kings see glory — direct parallel to the offspring being acknowledged as blessed.
Isaiah 44:3 promises God's Spirit and blessing on offspring, paralleling the blessing on descendants here.
In Isaiah 45:25, all the offspring of Israel are justified and glory in the Lord — parallel focus on the blessed status of descendants.
In Genesis 26:28, Abimelech recognizes that God is with Isaac — the same pattern of outsiders acknowledging God's blessing on Abraham's offspring.
In Genesis 30:27, Laban tells Jacob that the LORD has blessed him because of Jacob — again, outsiders see God's blessing on the patriarch.
In Zephaniah 3:20, God promises to make Israel renowned and praised among all peoples — the same promise of worldwide recognition.
Malachi 3:12 echoes this promise of nations calling Israel blessed, reinforcing the theme of restored blessing.
Genesis 22:18 promises that in Abraham's offspring all nations will be blessed, linking to the blessing on descendants here.
In Psalm 69:36, the offspring of God's servants inherit the land — both speak of the blessed future of faithful offspring.
Zechariah 8:13 declares Israel will become a blessing among nations, similar to being acknowledged as blessed here.