Matthew 26:48

48The [one]ὁthenδὲbetrayingπαραδιδοὺςHimαὐτὸνgaveἔδωκενthemαὐτοῖςa signσημεῖονsayingλέγων·WhomeverὋνἂνI shall kissφιλήσωHeαὐτόςit isἐστιν·seizeκρατήσατεHimαὐτόν.

And the one betraying Him gave them a sign, saying, “Whomever I shall kiss, it is He; seize Him.”