1 Corinthians 16:20

20.Salute one another with a holy kiss. The practice of kissing was very common among the Jews, as is manifest from the Scriptures. In Greece, though it was not so common and customary, it was by no means unknown; but the probability is, that Paul speaks here of a solemn kiss, with which they saluted each other in the sacred assembly. For I could easily believe, that from the times of the Apostles a kiss was used in connection with the administration of the Supper; (172) in place of which, among nations that were somewhat averse to the practice of kissing, there crept in the custom of kissing the patine. (173) However this may be, as it was a token of mutual love. I have no doubt, that Paul meant to exhort them to the cultivation of good-will among themselves — not merely in their minds (174) and in needful services, but also by that token, provided only it was holy, that is, neither unchaste nor deceitful, (175) — though, at the same time, holy may be taken to mean sacred.