Council of Ephesus
If any of the clergy should fall away, and publicly or privately presume to maintain the doctrines of Nestorius or Celestius, it is declared just by the holy Synod that these also should be deposed.
Source details
A.D. 431 · Canon 4 (431)
Checked word-for-word against Nicene and Post-Nicene Fathers, Series 2, Vol. 14 · 2026-07-26