Musnad Ahmad 1060:56

Yahya ibn Sa'id narrated to us, from Shu'bah; and 'Adi ibn Thabit and Muhammad ibn Ja'far narrated to me, Shu'bah narrated to us, from 'Adi ibn Thabit, from 'Abdullah ibn Yazid, from Abu Ayyub: "That the Messenger of Allah (ﷺ) combined the two prayers at Jam' (Muzdalifah)."