What did the Prophet Muhammad (saw) advise 'Abdullah b. 'Amr (Allah be pleased with them) to do with the Qur'An?
 'Abdullah b. 'Amr (Allah be pleased with them) reported:                      The Messenger of Allah (may peace be upon him) 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.