Sahih Muslim 2732
صحيح مسلم#2732SahihAbdullah b. 'Amr (Allah be pleased with them) reported:The Messenger of Allah (ﷺ) said to me: Recite the whole of the Qur'An during every month. I said: I find power (to recite it) in a shorter period. He said: Then recite it in twenty nights. I said: I find power (to recite it in a shorter period even than this), whereupon he said: Then recite it in seven (nights) and do not exceed beyond it
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 13:238