“Kiss the Son, lest He be angry, And you perish in the way, When His wrath is kindled but a little. Blessed are all those who put their trust in Him.” – Psa. 2:12
“Kiss the Son” is to “pay Him homage,” salute Him as King; to show Him the respect He deserves.
To not, is to insult the King and thereby draw His ire and wrath.
Blessed/happy are those who trust the Lamb and show Him the honor due Him. Woe to those who do not.