سنن النسائي

It was narrated that Ibn 'Abbas said: "The Prophet (ﷺ) drew back the curtain when the people were in rows behind Abu Bakr, may Allah be pleased with him, and said: 'O people, there is nothing left of the features of Prophethood except a good dream that a Muslim sees or is seen by others for him.' Then he said: 'Verily, I have been forbidden from reciting the Qur'an when bowing or prostrating. As for bowing, glorify the Lord therein, and as for prostration, strive hard in supplication for it is more deserving of a response.'"