Ahnaf Ibn Qais was from the people of intelligence and eloquence, and from the notables of the people of Basra.  Ibnul Mubaarak (rahimahullaah) said: A man abused Al-Ahnaf, so when he (i.e. the man) finished, he (i.e. Ahnaf) said, ”Allaah concealed much more (than what you said).”

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Source: Seeratus Salaf As-Saaleh’ by Imaam Ismaaeel Bin Muhammad Bin Fadl Al-Asbahaanee (535AH: Chapter: A mention of those who followed the companions in righteousness