Musnad Ahmad 2:22

Ya'qub narrated to us, my father narrated to us, from Ibn Ishaq, who said: And Al-'Ala' ibn 'Abd al-Rahman narrated to me, from a man of Banu Sahm, from Ibn Majidah al-Sahmi, that he said: Abu Bakr performed Hajj among us during his caliphate... then he mentioned the hadith.