Council of Chalcedon
Council of Chalcedon, Canon V
Definition of faith and received canons; reception qualifications retained; not the full proceedings
Canon V
Concerning bishops or clergymen who go about from city to city, it is decreed that the canons enacted by the Holy Fathers shall still retain their force.
Translation: Henry R. Percival, The Seven Ecumenical Councils, NPNF II.14 (1900), via CCEL.
Source: Council of Chalcedon (CCEL)