Abu khaythama (rahimahullaah) reported in Kitaabul Ilm with a chain of transmission going back to Hasan al-Basri, who said: ” When a man sits amongst the people and they consider him to be ignorant even though he is not, then this is the Muslim who possesses  understanding in truth.

[Source: Kitaabul Ilm of Abu khaytham with the checking of Imaam Al Albaanee: page:10.  Narration number:20]