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Pope Declares Seventh-day Sabbath-keepers Cannot Be Saved!
It [the Roman Church] firmly believes, professes, and teaches that the matter pertaining to the law of the Old Testament, of the Mosaic law, which are divided into ceremonies, sacred rites, sacrifices, and sacraments, because they were established to signify something in the future, although they were suited to the divine worship at that time, after our Lord's coming had been signified by them, ceased, and the sacraments of the New Testament began; and that whoever, even after the passion, placed hope in these matters of the law and submitted himself to them as necessary for salvation, as if faith in Christ could not save without them, sinned mortally. Yet it does not deny that after the passion of Christ up to the promulgation of the Gospel they could have been observed until they were believed to be in no way necessary for salvation; but after the promulgation of the Gospel it asserts that they cannot be observed without the loss of eternal salvation. All, therefore, who after that time observe circumcision and the Sabbath and the other requirements of the law, it declares alien to the Christian faith and not in the least fit to participate in eternal salvation, unless someday they recover from these errors.
Source: Pope Eugene IV, Papal Bull Cantate Domino, dated February 4th, 1442, Denzinger, The Sources of Catholic Dogma, Translated by Roy J. Deferrari, from the Thirtieth Edition of Henry Denzinger's Enchiridion Symbolorum, published by B. Herder Book Co., Copyright 1957, page 228, #712.