Canon 671 - §1. Catholic ministers licitly administer the sacraments only to Catholic Christian faithful, who, likewise, licitly receive the sacraments only from Catholic ministers.
§2. If necessity requires it or genuine spiritual advantage suggests it and provided that the danger of error or indifferentism is avoided, it is permitted for Catholic Christian faithful, for whom it is physically or morally impossible to approach a Catholic minister, to receive the sacraments of penance, the Eucharist and anointing of the sick from non-Catholic ministers, in whose Churches these sacraments are valid.
§3. Likewise Catholic ministers licitly administer the sacraments of penance, the Eucharist and anointing of the sick to Christian faithful of Eastern Churches, who do not have full communion with the Catholic Church, if they ask for them on their own and are properly disposed. This holds also for the Christian faithful of other Churches, who according to the judgment of the Apostolic See, are in the same condition as the Eastern Churches as far as the sacraments are concerned.
§4. If there is a danger of death or another matter of serious necessity in the judgment of the eparchial bishop, the synod of bishops of the patriarchal Church or the council of hierarchs, Catholic ministers licitly administer the same sacraments also to other Christians not having full communion with the Catholic Church, who cannot approach the ministers of their own ecclesial communities and who request them on their own, provided they manifest a faith consonant with that of the Catholic Church concerning these sacraments and are rightly disposed.
§5. For the cases in §§2, 3 and 4, norms of particular law are to be enacted only after consultation with at least the local competent authority of the non-Catholic Church or ecclesial community concerned.