Did you not read? The passage I quoted was written by Clement in AD 80 - during the time some of the Epistles were being written, and before John wrote anything.
1 Timothy 3:1-7
"This is a true saying, if a man desire the office of a BISHOP, he desireth a good work. A BISHOP then must be blameless, the husband of one wife, vigilant, sober, of good behaviour, given to hospitality, apt to teach; Not given to wine, no striker, not greedy of filthy lucre; but patient, not a brawler, not covetous; One that ruleth well his own house, having his children in subjection with all gravity; (For if a man know not how to rule his own house, how shall he take care of the church of God?) Not a novice, lest being lifted up with pride he fall into the condemnation of the devil. Moreover he must have a good report of them which are without; lest he fall into reproach and the snare of the devil."
Where do you suppose the bishops came from in the first place?
P.S. Paul was writing to Timothy in the above passage.
I Timothy 1:1-2
PAUL, an apostle of Jesus Christ by the commandment of God our Saviour, and Lord Jesus Christ, which is our hope; Unto TIMOTHY, my own son in the faith: Grace, mercy, and peace, from God our Father and Jesus Christ our Lord.