Musnad Abu Ya'la al-Mawsili 152:127

Abu Khaythama narrated to us, Muhammad ibn Khazim narrated to us, al-A'mash narrated to us, from Ibrahim, from 'Abd al-Rahman ibn Yazid, who said: 'Abd Allah threw seven pebbles at the Jamrat al-'Aqaba from the bottom of the valley, saying "Allahu Akbar" with every pebble. He said: It was said to him, "Indeed, some people throw them from above it." 'Abd Allah said: "By the One besides whom there is no god, this is the standing place of the one upon whom Surat al-Baqarah was revealed."