Salute one another with an holy kiss,.... Christian salutation is a wishing all temporal, spiritual, and eternal happiness, to one another; and which, as it should be mutual, should be also hearty and sincere, and this is meant by the "holy kiss"; the allusion is to a common custom in most nations, used by friends at meeting or parting, to kiss each other, in token of their hearty love, and sincere affection and friendship for each other; and is called "holy", to distinguish it from an unchaste and lascivious one; and from an hypocritical and deceitful one, such an one as Joab gave to Amasa, when, inquiring of his health, he took him by the beard to kiss him, and stabbed him under the fifth rib, 2Sa 20:9; and as Judas, who cried, hail master, to Christ, and kissed him, and betrayed him into the hands of his enemies, Mt 26:49.
I say, it is an allusion to this custom, for it is only an allusion; the apostle did not mean that any outward action should be made use of, only that their Christian salutations should not be mere complaisance, or expressed by bare words, and outward gestures and actions, either of the hand or mouth; but that they should spring from real love and true friendship, and be without dissimulation, hearty and sincere:the churches of Christ salute you.