The Long Āgama Sūtra 22.37

22.37

爾時，世尊告五百婆羅門曰：「若種德婆羅門容貌醜陋，無有種姓，諷誦不利，無有辯才、智慧、善答，不能與我言者，汝等可語；若種德顏貌端正，種姓具足，諷誦通利，智慧辯才，善於問答，足堪與我共論義者，汝等且默，聽此人語。」

The Bhagavān then told the five hundred priests, “If this priest Śroṇatāṇḍya were ugly, lacked [a respectable] caste and clan, hadn’t mastered the Vedas, and lacked eloquence, wisdom, and good answers, he wouldn’t be the one speaking with me, and you could speak. Since the priest Śroṇatāṇḍya is handsome, perfect in caste and clan, has mastered the Vedas, and is wise, eloquent, and good at answering questions, he’s qualified to have a discussion with me. The rest of you, remain silent and let this man speak.”