1Ti 3:2 A bishop then must be blameless, the husband of one wife, vigilant, sober, of good behaviour, given to hospitality, apt to teach;.......
1Ti 3:4 One that ruleth well his own house, having his children in subjection with all gravity;
1Ti 3:5 (For if a man know not how to rule his own house, how shall he take care of the church of God?)
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Tts 1:5 For this cause left I thee in Crete, that thou shouldest set in order the things that are wanting, and ordain elders in every city, as I had appointed thee:
Tts 1:6 If any be blameless, the husband of one wife, having faithful children not accused of riot or unruly.
Tts 1:7 For a bishop must be blameless, as the steward of God; not selfwilled, not soon angry, not given to wine, no striker, not given to filthy lucre;.....
This verse refers to bishops that were widowers. Paul is instructing that these widowers could not remarry. The verse also refers to those bishops who were currently married. They also could not remarry (in the Catholic Church's Eastern rite, priests are allowed to marry; celibacy is only a disciplinary rule for the clergy of the Roman rite). Therefore, this text has nothing to do with imposing a marriage requirement on becoming a bishop.