Albert Barnes Commentary 2 Samuel 14:33

"So Joab came to the king, and told him; and when he had called for Absalom, he came to the king, and bowed himself on his face to the ground before the king: and the king kissed Absalom." — 2 Samuel 14:33 (ASV)

Kissed - This was the pledge of reconciliation. (See the marginal references and Genesis 45:15.)