Council of Ephesus, Canon V

If any have been condemned for evil practices by the holy Synod, or by their own bishops; and if, with his usual lack of discrimination, Nestorius (or his followers) has attempted, or shall hereafter attempt, uncanonically to restore such persons to communion and to their former rank, we have declared that they shall not be profited thereby, but shall remain deposed nevertheless.

Translation: Henry R. Percival, The Seven Ecumenical Councils, NPNF II.14 (1900), via CCEL.