Well, Paul (dead human mortal) is not the one I follow it is Jesus
Just some scripture references besides the ones where St. Paul refers to the saints (”saint” meaning “believers redeemed by God”, not meaning persons codified by the liturgical churches) reigning in God’s kingdom:
Old Testament Daniel 7:18, 22, & 27 speaks of the saints taking possession of the kingdom, in a manner meaning to rule.
Revelation 3:21 where Jesus Himself spoke in St. John’s vision of the end of days, to the 7 churches, revealing to John that those who overcome will be given the right to sit with Him (Jesus) on His throne. Sitting on the throne refers to sharing with Him in His reign - and that’s not my personal interpretation.
Revelation 22:5 where it is revealed to this same John that the saints will reign with Christ forever and ever.
Revelation 5:9-10 where it is again revealed to John that the saints will reign with Christ forever
Revelation 2:26-27 where once again, Jesus Himself, in speaking to the 7 churches says that those who overcome in this life He will them power over the nations, to rule and reign, just as He received this power to rule the nations from His Father (God the Father).