Relating Hadith... or not!

Someone said to Ashab, "If you were to relate ahadith (traditions) and stop telling jokes, you would be doing a noble thing." "By God!" answered Ashab, "I have heard traditions and related them." "Then tell us", said the man. "I heard from Nafai," said Ashab, "on the authority of such-and-such, that the Prophet, may God bless him, said, "There are two qualities, such that whoever has them is among God's elect." "That is a fine tradition", said the man. "What are these two qualities?" "Nafai forgot one and I forgot the other," replied Ashab.