In the midst of Judah's destruction and desolation, God tells prophet Jeremiah a wonderful promise that "I will make the descendants of David my servant and the Levites who minister before as countless as the stars of the sky and as measureless as the sand on the seashore" (Jeremiah 33:22).
Only Levites could serve as priests. King David is a type of believer today who can both reign (an overcomer) and minister to the Lord by our worship. The promise the Lord made to the prophet and people of Judah extends to us today through Jesus Christ.
Revelation 5:10 says, "You have made them to be a kingdom and priests to serve our God, and they will reign on the earth."
We can reign in this life as overcomers, ministers to the Lord, who is our High Priest (Hebrews 8:1).