In Revelation 5:9-10, Jesus is worshiped in heaven because:

…You were slain, and by Your blood You ransomed people for God

From every tribe and language and people and nation.

And You have made them a kingdom and priests to our God,

And they shall reign on the earth, (Rev. 5:9-10 ESV)

Then in Revelation 7, we get a partial glimpse of the truth of the statement above.

After this I looked, and behold, a great multitude that no one could number, from every nation, from all tribes and peoples and languages, standing before the throne and before the Lamb, clothed in white robes, with palm branches in their hands, and crying out with a loud voice, “Salvation belongs to our God who sits on the throne, and to the Lamb!” (Rev. 7:9-11 ESV).

The question for the moment is, “How did John know the worshipers came from every nation, from all tribes and peoples and languages”?  The easy answer is they all retained their national, ethnic and linguistic distinctives.  As John scanned the vast crowd, he could easily tell they didn’t look, dress, sound or act just like him.  The crowd was a rich tapestry of colors and customs. 

A fuller answer to the question is that this glorious array of colors and custom is exactly what God planned from the beginning.  In Genesis 22:18, God promised He would bless all the nations of the earth through Abraham’s offspring – the Messiah.  In Matthew 24:14, Jesus said that the gospel of the kingdom had to be preached throughout the whole world as a testimony to all nations, before He would come again.  Ephesians 2:14-16 says Jesus has made people from every nation, tribe, people, and language into one Church.  He has broken down the dividing wall of hostility so that He might reconcile us all to God in one body through the cross, thereby killing our hostility. 

God’s glory is displayed through His creativity and His ability to redeem all kinds of people and form them into one unified but highly diverse organism.