Musnad Ahmad 30:862

Sufyan narrated to us, Ibn Jurayj narrated to us, from Abu al-Zubayr, from Abu Salih, from Abu Hurayrah—if Allah wills—from the Prophet, peace and blessings of Allah be upon him: "It is imminent that you will strike—and Sufyan said once: that people will strike—the livers of camels, seeking knowledge, and they will not find a scholar more knowledgeable than the scholar of the people of Medina." And a group said: He is al-Umari. He said: So they preferred Malik.