Musnad Ahmad 22:39

Abu Kamil narrated to us, Hammad—meaning Ibn Salamah—narrated to us, from ‘Amr ibn Dinar, from Ibn ‘Abbas, from al-Fadl ibn ‘Abbas: "That the Prophet, may Allah bless him and grant him peace, stood in the Ka‘bah, and he glorified Allah (said SubhanAllah), and magnified Him (said Allahu Akbar), and supplicated to Allah, and sought His forgiveness, and he did not bow (ruku‘) and he did not prostrate (sujud)."