A riddle... a parable. — What the prophet has to say is called a riddle as well as a parable, because there is something in it recondite and obscure — something which, until it is explained, should excite the minds of the people to guess its meaning.
Related Commentaries of Ezekiel 17:2
Ezekiel 17:2
2 Son of man, put forth a riddle, and speak a parable unto the house of Israel;