Musannaf Ibn Abi Shayba 3:1835

Abu Mu'awiyah narrated to us, from al-Shaybani, from Sa'id ibn Jubayr, who said: I was traveling with Abu Ubaydah between al-Kufa and al-Hira, and he recited a prostration (verse). I went to dismount in order to prostrate, and he said: "It suffices you to gesture with your head." He said: And he gestured with his head.