Romans 15, the epistle reading for the second Sunday in Advent, refers back to Isaiah 11's prophesy about the coming Messiah, the Root of Jesse.
"For I tell you that Christ became a servant to the circumcised to show God's truthfulness, in order to confirm the promises given to the patriarchs, 9 and in order that the Gentiles might glorify God for his mercy. As it is written,
and sing to your name.”
And again it is said,“Rejoice, O Gentiles, with his people.”
“Praise the Lord, all you Gentiles,
and let all the peoples extol him.”
And again Isaiah says,
“The root of Jesse will come, even he who arises to rule the Gentiles; in him will the Gentiles hope.”
May the God of hope fill you with all joy and peace in believing, so that by the power of the Holy Spirit you may abound in hope." (Romans 15:8-13)
Isaiah 11 is incredibly rich in its description of the Messiah.
"There shall come forth a shoot from the stump of Jesse,
and a branch from his roots shall bear fruit.
2 And the Spirit of the Lord shall rest upon him,
the Spirit of wisdom and understanding,
the Spirit of counsel and might,
the Spirit of knowledge and the fear of the Lord.
3 And his delight shall be in the fear of the Lord.
He shall not judge by what his eyes see,
or decide disputes by what his ears hear,
4 but with righteousness he shall judge the poor,
and decide with equity for the meek of the earth;
and he shall strike the earth with the rod of his mouth,
and with the breath of his lips he shall kill the wicked.
5 Righteousness shall be the belt of his waist,
and faithfulness the belt of his loins.
6 The wolf shall dwell with the lamb,
and the leopard shall lie down with the young goat,
and the calf and the lion and the fattened calf together;
and a little child shall lead them.
7 The cow and the bear shall graze;
their young shall lie down together;
and the lion shall eat straw like the ox.
8 The nursing child shall play over the hole of the cobra,
and the weaned child shall put his hand on the adder's den.
9 They shall not hurt or destroy
in all my holy mountain;
for the earth shall be full of the knowledge of the Lord
as the waters cover the sea.
10 In that day the root of Jesse, who shall stand as a signal for the peoples—of him shall the nations inquire, and his resting place shall be glorious."