Musnad Ahmad 322:1

Muhammad ibn Ja‘far narrated to us, he said: Shu‘bah narrated to us, and Hajjaj said: Shu‘bah informed us, from ‘Abd Rabbih ibn Sa‘id—and Ghundar said: ‘Abd Rabbih ibn Sa‘id—from Muhammad ibn Ibrahim, he said: Someone who saw the Prophet, may Allah bless him and grant him peace, at Ahjar al-Zayt informed me that he was "supplicating with his palms." Hajjaj said: And Shu‘bah raised his palms and spread them out.