2 Samuel 20:9-10

20:9 Joab said to Amasa, “How are you, my brother?” With his right hand Joab took hold of Amasa’s beard as if to greet him with a kiss. 20:10 Amasa did not protect himself from the knife in Joab’s other hand, and Joab stabbed him in the abdomen, causing Amasa’s intestines to spill out on the ground. There was no need to stab him again; the first blow was fatal. Then Joab and his brother Abishai pursued Sheba son of Bicri.

Psalms 55:21

55:21 His words are as smooth as butter,

but he harbors animosity in his heart.

His words seem softer than oil,

but they are really like sharp swords.

Proverbs 27:6

27:6 Faithful are the wounds of a friend,

but the kisses of an enemy are excessive.

Matthew 26:48-50

26:48 (Now the betrayer had given them a sign, saying, “The one I kiss is the man. Arrest him!”) 26:49 Immediately he went up to Jesus and said, “Greetings, Rabbi,” and kissed him. 26:50 Jesus said to him, “Friend, do what you are here to do.” Then they came and took hold of Jesus and arrested him.

Mark 14:44-46

14:44 (Now the betrayer had given them a sign, saying, “The one I kiss is the man. Arrest him and lead him away under guard.”) 14:45 When Judas arrived, he went up to Jesus immediately and said, “Rabbi!” and kissed him. 14:46 Then they took hold of him and arrested him.