'Abdullah bin 'Amr (RA) 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.