Musannaf Ibn Abi Shayba 17:1151

Abu Bakr narrated to us, he said: Aswad bin Amir narrated to us, he said: Umarah bin Zadhan narrated to us, he said: Ali bin al-Hakam narrated to us, from Ata bin Abi Rabah, from Abu Hurairah, that the Prophet (peace and blessings of Allah be upon him) said: "There is no man who memorizes knowledge, then is asked about it and conceals it, but he will come on the Day of Resurrection bridled with a bridle of fire."