Canon 23
We have learned that is not so hard to find those who follow ancient errors by celebrating the kalends of January, even though Ianus was a pagan, a king, but certainly not a God. Anyone, therefore, who believes in one God the Father, ruling with the Son and the Holy Spirit, cannot call himself a true Christian, if he diverges from this and observes some other pagan [rites]. There are also those who during the feast of the chair (cathedra) of Lord Peter offer potage (intrita) to the dead. Having returned to their houses after the Mass, they turn back to pagan errors and receive food dedicated to the demons just after the body of the Lord.
We appeal to both shepherds and presbyters to address this concern and repel from the Church by holy authority those who persist in this foolishness or perform it at I know not what stones or trees or near springs, designated as pagan sites, [rites] which violate Church doctrine, and forbid participation at the holy altar to those who observe pagan rites. For what is the common ground between the demons and Christ, when the sins which deserve condemnation seem to multiply rather than be purged?
(trans. J. Szafranowski)