Asim (may Allah have mercy on him) said: Zirr bin Hubaysh (may Allah have mercy on him) was among the most eloquent of people in Arabic, and Ibn Mas'ud (may Allah be pleased with him) used to ask him about the Arabic language.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب آداب القاضي / 20330