This proveth no more, than that as it is in use with us to salute one another with a kiss when we meet; so it was in use in those times and countries to do the like, in token of love and friendship. It is called the kiss of charity, 1 Peter 5:14. The apostle requireth, that in these salutations they should have chaste and holy thoughts. This seemeth to be all meant by the holy kiss, mentioned Romans 16:16 2 Corinthians 13:12 1 Thessalonians 5:26, and here.
Related Commentaries of 1 Corinthians 16:20
1 Corinthians 16:20
20 All the brethren greet you. Greet ye one another with an holy kiss.