Luke depicts the problem of incorporating Gentiles into the Church as rooted in conflicting definitions of purity. Apart from the principal Torah distinction between clean and unclean animals, a third category is mentioned: ‘common’, referring to doubtfully pure food. Parallels to this usage are found in a range of Jewish literature, from the Hasmonaean to the Rabbinic period. The notion of doubtfully pure food can help explain Peter's refusal to slaughter and eat from the mixed group of animals in his vision. Categorizing people like Cornelius as ‘potentially defiled’ may have constituted a human ‘fence’ between scrupulous Jews and unclean pagans. Adherence to the stipulations of the apostolic decree by Gentile Christians removed the last hindrance to Jewish Christians having table fellowship with them.