The Canons of the Council in Trullo; Often Called The Quinisext Council 20Canon XX.

The Seven Ecumenical Councils · The Nicene and Post-Nicene Fathers Series II Volume XIV: The Seven Ecumenical Councils by Philip Schaff

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It shall not be lawful for a bishop to teach publicly in any city which does not belong to him. If any shall have been observed doing this, let him cease from his episcopate, but let him discharge the office of a presbyter.