Isaiah 9: God's Chosen People Expanded in Jesus

²The people walking in darkness
have seen a great light;
a light has dawned
on those living in the land of darkness.
³ You have enlarged the nation
and increased its joy.
The people have rejoiced before You
as they rejoice at harvest time
and as they rejoice when dividing spoils.
⁴ For You have shattered their oppressive yoke
and the rod on their shoulders,
the staff of their oppressor,
just as You did on the day of Midian.
⁵ For the trampling boot of battle
and the bloodied garments of war
will be burned as fuel for the fire.
⁶ For a child will be born for us,
a son will be given to us,
and the government will be on His shoulders.
He will be named
Wonderful Counselor, Mighty God,
Eternal Father, Prince of Peace.
⁷ The dominion will be vast,
and its prosperity will never end.
He will reign on the throne of David
and over his kingdom,
to establish and sustain it
with justice and righteousness from now on and forever.
The zeal of the LORD of Hosts will accomplish this.

 This passage, speaking about what Jesus would make happen with His birth and life, talks about how God has enlarged the nation of Israel and how God's people rejoice greatly. The nation of Israel, God's chosen people, is enlarged in Jesus to include more than was acceptable to the religious leaders of the first century. Israel, representing God's chosen people comes to include Jews and non-Jews alike, those who were accepted by society and those who were rejected, rich and poor, male and female, anyone willing to accept the gift Jesus offered.

^{Galatians 3:28} There is no Jew or Greek, slave or free, male or female; for you are all one in Christ Jesus. ²⁹ And if you belong to Christ, then you are Abraham’s seed, heirs according to the promise.