A.T. Robertson Commentary 2 Corinthians 13:12

"Salute one another with a holy kiss." — 2 Corinthians 13:12 (ASV)

With a holy kiss (εν αγιω φιληματ). In the Jewish synagogues where the sexes were separated, men kissed men, the women, women. This apparently was the Christian custom also. It is still observed in the Coptic and the Russian churches. It was dropped because of charges made against the Christians by the pagans. In England in 1250 Archbishop Walter of York introduced a "pax-board" which was first kissed by the clergy and then passed around. Think of the germ theory of disease and that kissing tablet!