First Council of Constantinople, Canon VII

Those who from heresy turn to orthodoxy, and to the portion of those who are being saved, we receive according to the following method and custom:  Arians, and Macedonians, and Sabbatians, and Novatians, who call themselves Cathari or Aristori, and Quarto-decimans or Tetradites, and Apollinarians, we receive, upon their giving a written renunciation [of their errors] and anathematize every heresy which is not in accordance with the Holy, Catholic, and Apostolic Church of God.  Thereupon, they are first sealed or anointed with the holy oil upon the forehead, eyes, nostrils, mouth, and ears; and when we seal them, we say, “The Seal of the gift of the Holy Ghost.”  But Eunomians, who are baptized with only one immersion, and Montanists, who are here called Phrygians, and Sabellians, who teach the identity of Father and Son, and do sundry other mischievous things, and [the partisans of] all other heresies—for there are many such here, particularly among those who come from the country of the Galatians:—all these, when they desire to turn to orthodoxy, we receive as heathen.  On the first day we make them Christians; on the second, catechumens; on the third, we exorcise them by breathing thrice in their face and ears; and thus we instruct them and oblige them to spend some time in the Church, and to hear the Scriptures; and then we baptize them.

Edition and transmission

The source editor records later transmission of this received canon and its relationship to a letter to Martyrius; it is not presented as an undisputed enactment of 381.

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