Musnad Ahmad 596:3

Abdullah ibn al-Walid al-Adani narrated to us, Sufyan narrated to us, from Mansur, from Salim ibn Abi al-Ja’d, from Abu Kabshah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) struck a parable for this Ummah, like four men. Then he mentioned the hadith.