Musnad Ahmad 28:306

Abu Mu'awiyah narrated to us, Hajjaj narrated to us, from 'Amr ibn Shu'ayb, from his father, from his grandfather, that the Messenger of Allah (may Allah bless him and grant him peace) stood at the second Jamrah longer than he stood at the first Jamrah. Then he came to the Jamrat al-Aqabah and threw pebbles at it, and he did not stand at it.