Matthew 26:48
"Now he that betrayed him gave them a sign, saying, Whomsoever I shall kiss, that same is he: hold him fast."
Cross References (ranked by relevance)
2 Samuel 3:27
And when Abner was returned to Hebron, Joab took him aside in the gate to speak with him quietly, and smote him there under the fifth rib, that he died, for the blood of Asahel his brother.
Psalm 28:3
Draw me not away with the wicked, and with the workers of iniquity, which speak peace to their neighbours, but mischief is in their hearts.
Mark 14:44
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.