Abdullah bin Abbas reported,
The Messenger of Allah ﷺ drew back the curtain while the people were standing in rows behind Abu Bakr, and he said, "People, nothing remains of the glad tidings of prophethood except a true dream that a Muslim sees or that is seen for him. Indeed, I have been forbidden to recite the Quran while bowing or prostrating. As for bowing, magnify the Lord 
in it. As for prostration, strive earnestly in supplication, for it is fitting that you be answered."
Azami 771
Sahihعن ابن عباس قال
كشف رسول الله ﷺ الستارة والناس صفوف خلف أبي بكر، فقال: أيها الناس، إنه لم يبق من مبشرات النبوة إلا الرؤيا الصالحة يراها المسلم، أو ترى له، ألا وإني نهيت أن أقرأ القرآن راكعا أو ساجدا. وأما الركوع فعظموا فيه الرب عز وجل، وأما السجود فاجتهدوا في الدعاء فقمن أن يستجاب لكم.
Muslim narrated it in the Book of Prayer (479) through several routes from Sufyan bin Uyayna, who said, Sulayman bin Suhaym told me, from Ibrahim bin Abdullah bin Mabad, from his father, from Ibn Abbas, and he related it.As for his saying "qamanun," it is with fatha on the qaf and kasra on the mim, meaning fitting and worthy.