Musnad Ahmad 583:1

'Abd al-Malik ibn 'Amr narrated to us, Mujammi' ibn Ya'qub, from the people of Quba', narrated to us, he said: Muhammad ibn Isma'il narrated to me, that some of his family said to his maternal grandfather, and he is 'Abdullah ibn Abi Habibah: "What did you reach of the Messenger of Allah, may Allah bless him and grant him peace?" He said: "He came to us in this mosque of ours, so I came and sat by his side. Then a drink was brought, and he drank, then he handed it to me, and I was on his right side." He said: "And I saw him on that day pray in his sandals, and I was a young boy on that day."