The word here [ed. note: Jerome reads ‘communicat.’ The Vulgate has, coinquinat] ‘makes a man common’ is peculiar to Scripture, and is not hackneyed in common parlance. The Jewish nation, boasting themselves to be a part of God, call those meats common, of which all men partake; for example, swine’s flesh, shell fish, hares, and those species of animals that do not divide the hoof, and chew the cud, and among the fish such as have not scales. Hence in the Acts of the Apostles we read, “What God hath cleansed, that call not thou common.” [Acts 10:15] Common then in this sense is that which is free to the rest of mankind, and as though not in part of God, is therefore called unclean.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).