Musnad Ahmad 27:1245

Abdullah ibn Ahmad said: Ja'far ibn Humayd narrated to us, Ubaydullah ibn Iyad ibn Laqit narrated to us, Iyad informed us, from Abd al-Rahman al-A'raji, from Ibn Umar—and he did not doubt it—from the Prophet, may Allah bless him and grant him peace, the like of it.