Then in that day the nations will resort to the root of Jesse, who will stand as a signal for the peoples; and His resting place will be glorious. Isaiah 11:10
The people of Israel were waiting for this propecy to come true - that the root of Jesse would be an ensign (a sign, a banner, a signal) of their people. That He would come as their redeemer and deliverer, and He would bring peace and justice to the nations. That their King would come and be among them.
And the Word became flesh, and dwelt among us, and we saw His glory, glory as of the only begotten from the Father, full of grace and truth. John 1:14
This would not be a normal, earthly king. Rulers would fall silent before Him, King of the nations.
Who would not fear You, O King of the nations? Indeed it is Your due! For among all the wise men of the nations and in all their kingdoms, there is none like You. Jeremiah 10:7
This would be a King of mercy. A King who would restore His people.
Therefore thus says the Lord GOD, "Now I will restore the fortunes of Jacob and have mercy on the whole house of Israel; and I will be jealous for My holy name." Ezekiel 39:25
A King who will draw all men to Himself.
"And I, if I am lifted up from the earth, will draw all men to Myself." John 12:32
Rejoice! God has sent a King of mercy to draw us to Himself.
O come, Thou Root of Jesse’s tree,
An ensign of Thy people be;
Before Thee rulers silent fall;
All peoples on Thy mercy call.
Emmanuel shall come to thee, O Israel.