Narrated Abu Huraira reported God’s messenger as saying, “There are three whose supplication is not rejected:
one who has just ended a fast, a just imam, and one who has been wronged whose supplication is raised by God above the clouds and for which the gates of heaven are opened. The Lord says, ‘I swear by my might that I will certainly help you, though it be after some time’.”
I asked the Prophet’s permission to perform an ‘umra and he gave me permission, saying, “Include me in your supplication, little brother, and do not forget me.” Then he said a word to me for which I would not be willing to take the world in exchange.
Abu Dawud and Tirmidhi transmitted it, Tirmidhi’s version ending with “do not forget me.”
‘Abdallah b. ‘Amr reported God’s messenger as saying, “The supplication which gets the quickest answer is that made by one distant friend for another.”