Umar passed by Hassan when he was reciting verses in the mosque. He looked at him. Thereupon he said: I used to recite verses when there was present in it the one who was better than you (i.e. the Prophet).
Sunan Abi Dawud Book 43, Hadith 241
← Previous Hadith I heard the Messenger of Allah (ﷺ) say: In eloquence there is magic, in knowledge ignorance, in poetry wisdom, and in speech heaviness.

Sa'sa'ah ibn Suhan said: The Prophet of Allah (ﷺ) spoke the truth. His statement "In eloquence there is magic" means: (For example), there is a right due from a man who is more eloquent in reasoning than the man who is demanding his right. He (the defendant) charms the people by his speech and takes away his right. His statement "In knowledge there is ignorance" means: A scholar brings to his knowledge what he does not know, and thus he becomes ignorant of that. His statement "In poetry there is wisdom" means: These are the sermons and examples by which people receive admonition. His statement "In speech there is heaviness" means: That you present your speech and your talk to a man who is not capable of understanding it, and who does not want it.

Sunan Abi Dawud Book 43, Hadith 240 Next Hadith → so he (‘Umar’) feared that he would refer to the Messenger of Allah (May peace be upon him); therefore he allowed him.

Sunan Abi Dawud Book 43, Hadith 242