“Now he that betrayed him gave them a sign, saying, Whomsoever I shall kiss, that same is he: hold him fast.”
King James Version (KJV)
Mt 26:48,49 Gave them a sign. A kiss; a common method of salutation among intimate friends. A sign was needful to point Jesus out to the soldiers. Such a traitorous kiss was the depth of depravity--enmity under the guise of friendship.