Musnad Abu Ya'la al-Mawsili 109:302

Narrated to us Ibn Numayr, narrated to us Abu al-Jawwab, from ‘Ammar ibn Ruzayq, from al-A‘mash, from Abu Sufyan, from Jabir, who said: We pledged allegiance to the Prophet, may Allah bless him and grant him peace, under the tree, upon the condition that we would not flee.