Second Council of Constantinople, Capitulum XIV

If anyone shall defend that letter which Ibas is said to have written to Maris the Persian, in which he denies that the Word of God incarnate of Mary, the Holy Mother of God and ever-virgin, was made man, but says that a mere man was born of her, whom he styles a Temple, as though the Word of God was one Person and the man another person; in which letter also he reprehends St. Cyril as a heretic, when he teaches the right faith of Christians, and charges him with writing things like to the wicked Apollinaris.  In addition to this he vituperates the First Holy Council of Ephesus, affirming that it deposed Nestorius without discrimination and without examination.  The aforesaid impious epistle styles the XII. Chapters of Cyril of blessed memory, impious and contrary to the right faith and defends Theodore and Nestorius and their impious teachings and writings.  If anyone therefore shall defend the aforementioned epistle and shall not anathematize it and those who defend it and say that it is right or that a part of it is right, or if anyone shall defend those who have written or shall write in its favour, or in defence of the impieties which are contained in it, as well as those who shall presume to defend it or the impieties which it contains in the name of the Holy Fathers or of the Holy Synod of Chalcedon, and shall remain in these offences unto the end:  let him be anathema.

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