Read Mark 14:44 Using Other Translations
And he that betrayed him had given them a token, saying, Whomsoever I shall kiss, that same is he; take him, and lead him away safely.
Now the betrayer had given them a sign, saying, "The one I will kiss is the man. Seize him and lead him away under guard."
The traitor, Judas, had given them a prearranged signal: “You will know which one to arrest when I greet him with a kiss. Then you can take him away under guard.”