Liturgy of the Tridentine MassThe Mass is divided into two parts, the Mass of the Catechumens and the Mass of the Faithful. Catechumens, those being instructed in the faith, were once dismissed after the first half, not having yet professed the faith. Profession of faith was considered essential for participation in the Eucharistic sacrifice.
This rule of the Didache is still in effect. It is only one of the three conditions (baptism, right faith and right living) for admission to receiving Holy Communion that the Catholic Church has always applied and that were already mentioned in the early 2nd century by Saint Justin Martyr: "And this food is called among us the Eucharist, of which no one is allowed to partake but the man who believes that the things which we teach are true, and who has been washed with the washing that is for the remission of sins, and unto regeneration, and who is so living as Christ has enjoined" (First Apology, Chapter LXVI).
source: wikipedia
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