Musnad Ahmad 1034:63

Sulayman narrated to us, Isma'il narrated to us, 'Amr narrated to us, from 'Abdullah ibn 'Abd al-Rahman al-Ash-hali, from Hudhayfah ibn al-Yaman, that the Prophet, peace and blessings of Allah be upon him, said: "The Hour will not be established until the happiest of people in the world is the *lak' ibn lak'* (the base person, son of a base person)."