Romans 14:14

14. Unclean In the Greek, common; a word derived from Old Testament use as a term antithetic to consecrated or set apart. The term being Jewish, might seem to imply that the weaker brethren were Jews. But in New Testament use it came to signify impure or profane in general. Thus in Hebrews 10:29, it is applied to the despised blood of Christ, and translated unholy; and in Revelation 21:27, it is applied to any thing too impure to enter heaven. It is the word which the apostle, with his Jewish training, would use to designate that impurity which Orientalism attributed to all matter.