Whether it is always a mortal sin to communicate with an excommunicated person in other cases than those in which it is allowed?

❌ Objection 1 : It would seem that it is always a mortal sin to hold communion with an excommunicated person in other cases than those in which it is allowed. Because a certain decretal (Cap. Sacris: De his quae vi, metuve, etc.) declares that "not even through fear of death should anyone hold communion with an excommunicated person, since one ought to die rather than commit a mortal sin." But this would be no reason unless it were always a mortal sin to hold communion with an excommunicated person. Therefore, etc.

❌ Objection 2 : Further, it is a mortal sin to act against a commandment of the Church. But the Church forbids anyone to hold communion with an excommunicated person. Therefore it is a mortal sin to hold communion with one who is excommunicated.

❌ Objection 3 : Further, no man is debarred from receiving the Eucharist on account of a venial sin. But a man who holds communion with an excommunicated person, outside those cases in which it is allowed, is debarred from receiving the Eucharist, since he incurs a minor excommunication. Therefore it is a mortal sin to hold communion with an excommunicated person, save in those cases in which it is allowed.

❌ Objection 4 : Further, no one should incur a major excommunication save for a mortal sin. Now according to the law (Can. Praecipue, seqq., caus. xi) a man may incur a major excommunication for holding communion with an excommunicated person. Therefore it is a mortal sin to hold communion with one who is excommunicated.