Musnad Abu Ya'la al-Mawsili 110:60

And from Ibn ‘Uyaynah, he said: Sulayman ibn Suhaym narrated to me, from Ibrahim ibn ‘Abd Allah ibn Ma‘bad ibn ‘Abbas, from his father, from Ibn ‘Abbas, who said: The Messenger of Allah (may Allah bless him and grant him peace) drew back the curtain while the people were in rows behind Abu Bakr. He said: "O people, there remains nothing of the glad tidings of prophethood except for the righteous dream that a Muslim sees or is seen for him. "Behold, I have been forbidden from reciting [the Qur’an] while bowing or prostrating. As for the bowing, glorify the Lord therein; and as for the prostration, strive in supplication, for it is likely that it will be answered for you."