Abdullah 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.
Reference: Sahih Muslim 1159 d In-book : Book 13, Hadith 238 USC-MSA web (English) : Book 6, Hadith 2589 (deprecated)
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