Musnad Ahmad 30:1201

Yahya ibn Abi Bukayr narrated to us, Kamil Abu al-Ala narrated to us, he said: I heard Abu Salih, from Abu Hurayrah, he said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "Seek refuge in Allah from the beginning of the seventies, the rule of the boys." And he said: "The world will not pass away until it belongs to the base son of the base."