Reference: Siyar A’laam an-Nubalaa. – Volume 10, Page 34
It was said to ash-Shaafi’ee:
Do you take this hadeeth O Abaa ‘Abdillaah? So he said: When I narrate an authentic hadeeth on the authority of the Messenger of Allaah and do not adopt it, then I testify to you [all] that I have lost my mind.
