Musnad Ahmad 1167:5

'Abdullah ibn Idris narrated to us, he said: Ibn Ishaq narrated to us, from Yahya ibn 'Abbad ibn 'Abdullah ibn al-Zubayr, from his father, that Asma' bint Abi Bakr said: We went out with the Messenger of Allah (may Allah bless him and grant him peace) as pilgrims, until when we were at al-'Arj, the Messenger of Allah (may Allah bless him and grant him peace) dismounted. 'Aishah sat beside the Messenger of Allah (may Allah bless him and grant him peace), and I sat beside my father. The baggage camel of the Messenger of Allah (may Allah bless him and grant him peace) and the baggage camel of Abu Bakr were one, with the servant of Abu Bakr. Abu Bakr sat waiting for him to appear to him. He appeared, but his camel was not with him. He said: "Where is your camel?" He said: "I lost it last night." Abu Bakr said: "A single camel, and you lost it?" He began to strike him, and the Messenger of Allah (may Allah bless him and grant him peace) was smiling and saying: "Look at this man in ihram and what he is doing."