Musnad Abu Ya'la al-Mawsili 115:184

Abu Musa narrated to us, Abu 'Amir 'Abd al-Malik ibn 'Amr narrated to us, Hisham narrated to us, from Qatadah, from Anas: That the Messenger of Allah (peace and blessings of Allah be upon him) entered into the state of Ihram for Hajj and 'Umrah together.