Musnad Abu Ya'la al-Mawsili 1:127

Ubayd Allah ibn Mu'adh narrated to us, my father narrated to us, Shu'bah narrated to us, from al-Hakam, from Qays ibn Abi Hazim, from Abu Bakr al-Siddiq, with the like of that, not mentioning the Prophet, may Allah bless him and grant him peace.