1 Corinthians 5:4

in the name of our Lord Jesus, ye being gathered together, and my spirit, with the power of our Lord Jesus,

'in the name of our Lord Jesus' -The authority for this action doesn't originate with Paul. Jesus Himself commands that the following action be taken. (2 Thessalonians 3:6) So much for those that claim withdrawal doesn't manifest the love of Jesus. What doesn't manifest love for Jesus is persisting in sin! Jesus commanded that such action be taken. (Matthew 18:15)

'ye being gathered together' -i.e. such action was to take place in the assembly. 'But the action is not to be Paul's alone; nor is it to be understood as some sort of ecclesiastical tribunal. Rather, it is to be. community action.' (Fee p. 206)

'Church discipline, therefore, must be done in the full assembly of the church. Several reasons are given for this, such as (1) that the rest may fear (1 Timothy 5:19), (2) that the sinner might be publicly exposed, i.e. all the congregation knows where he stands (Romans 16:17), and (3) That the whole church might put forth an effort to restore him (Matthew 18:17)' (Willis p. 164)

'and my spirit' -lest someone question this action, Paul gives his full approval.

'with the power of our Lord Jesus' -'Disfellowshipping is not. man's idea; it's God's idea!..But no one can call Jesus his Lord if he refuses to submit to him in any area..The decision to sever the transgressor is made in heaven and it is carried out by God's agents on earth, the Church..and such an execution of the Lord's command is to be honored by the whole congregation...to drink only as much of the cup God gives you as you like is hardly the way of Christ.' [Note:. McGuiggan p. 62]

'Therefore, church discipline should not be lightly scoffed at as if it were the presumptive act of. group of arrogant people.' (Willis p. 164)

Church discipline rightly administered, has the full approval of heaven behind it!