Council of Trent
Council of Trent: Session XIII, On The Most Holy Sacrament Of The Eucharist, Canon IX
Waterworth (1848), Hanover transcription; separate papal documents excluded
On The Most Holy Sacrament Of The Eucharist, Canon IX
ON THE MOST HOLY SACRAMENT OF THE EUCHARIST
CANON IX.-If any one denieth, that all and each of Christ's faithful of both sexes are bound, when they have attained to years of discretion, to communicate every year, at least at Easter, in accordance with the precept of holy Mother Church; let him be anathema.
Translation: J. Waterworth, The Canons and Decrees of the Council of Trent (1848), Hanover Historical Texts Project transcription (1995).
Source: Council of Trent: Session XIII (Hanover Historical Texts Project)