1 Corinthians 6:2
Do ye not know that the saints shall judge the world? and if the world shall be judged by you, are ye unworthy to judge the smallest matters?
Note 3 at 1Co 6:2: Paul was reminding the believers at Corinth that they would someday share with Christ in judging and ruling the universe (Da 7:27; Re 5:10, 20:4, and 22:5), including judging the angels (1Co 6:3, 2Pe 2:4, and Jude 6). This reference probably engulfs Christ's teaching of His followers, sitting upon thrones, judging the twelve tribes of Israel (Mt 19:28 and Da 7:22), as well as Paul's reference to the saints ruling with Christ in His future kingdom (2Ti 2:12 and Ro 8:17).
Paul's point was this: if saints will someday judge the world, why are they looking to unbelievers to settle their trivial disputes and petty differences? Only God's point of view has eternal value, and many times His judgment and instruction are the opposite of the world's view (Mt 5:38-48, 6:19-21, 31-33; and Ro 12:19-21).