The zeal of the LORD of hosts has done this

Isaiah 9:
2 The people who walked in darkness have seen a great light; those who dwelt in a land of deep darkness, on them has light shined.
6 For to us a child is born, to us a son is given; and the government shall be upon his shoulder, and his name shall be called Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace.
7 Of the increase of his government and of peace there will be no end, …The zeal of the LORD of hosts will do this.

Luke 2:
11 For unto you is born this day in the city of David a Savior, who is Christ the Lord.
12 And this will be a sign for you: you will find a baby wrapped in swaddling cloths and lying in a manger.”
13 And suddenly there was with the angel a multitude of the heavenly host praising God and saying,
14 “Glory to God in the highest, and on earth peace among those with whom he is pleased!”