The Messenger of Allah ﷺ said, "There are three whose supplications are never rejected: the just ruler, the fasting person until he breaks his fast, and the supplication of the oppressed. Allah raises it above the clouds on the Day of Resurrection, and the gates of heaven are opened for it. Allah says, 'By My might, I shall surely grant you victory, even if after some time.'"
قال رسول الله ﷺ: ثلاثة لا ترد دعوتهم: الإمام العادل، والصائم حتى يفطر، ودعوة المظلوم يرفعها الله دون الغمام يوم القيامة، وتفتح لها أبواب السماء. ويقول: بعزتي لأنصرنك ولو بعد حين.
Reported by Ibn Majah (1752), Tirmidhi (3598), and Ahmad (10183), and graded sahih by Ibn Khuzayma (1901) and Ibn Hibban (3428). All of them narrate it from Saadan Juhani, from Saad Abu Mujahid Tai (who was thiqah), from Abu Madla (who was thiqah), from Abu Hurairah, and he mentioned it. The word "thiqah" here is Ibn Majah's own statement. Abu Madla has no hadith other than this one.Tirmidhi said, "This is a hasan hadith. Saadan Juhani is Saadan bin Bishr, from whom Isa bin Yunus, Abu Asim, and several other senior scholars of hadith have narrated. Abu Mujahid is Saad Tai. Abu Madla is the freed slave of the Mother of the Believers, Ayesha. We only know him through this hadith. This hadith is also narrated from him in a longer form than this." End of quote.Ibn Hajar also graded it hasan in his Amali Adhkar, as quoted from him by Ibn Allan in Sharh Adhkar (4/338).As for Ibn Madini's statement, "Abu Madla, the freed slave of Ayesha, his name is not known, he is majhul," the man was well known by his kunyah, and not knowing his name does not make him majhul. Ibn Majah in fact knew him and declared him thiqah, and others named him Ubaydullah bin Abdullah. Someone like this, when he narrates a hadith that contains nothing objectionable and has supporting evidence, his hadith is graded hasan. Indeed, Ibn Khuzayma and Ibn Hibban graded it sahih, and Tirmidhi and Ibn Hajar graded it hasan, as mentioned above.This hadith has also come from Abu Hurairah through another chain, with a hasan isnad, in this wording, "Three supplications are answered without doubt, the supplication of the wronged, the supplication of the parent, and the supplication of the traveler." Reported by Abu Dawud (1536), Tirmidhi (1905, 3448), Tabarani in Duaa (1314), Ahmad (7510), and Ibn Hibban (2699), all of them through routes from Hisham Dastawai, from Yahya bin Abu Kathir, from Abu Jafar the muezzin, that he heard Abu Hurairah say (and he mentioned the hadith).No one narrated from Abu Jafar the muezzin except Yahya bin Abu Kathir, and Al-Hafiz said in Taqrib, "Maqbul," meaning acceptable when corroborated, and indeed he has been corroborated in some parts of the hadith.As for what Bazzar reported, in Kashf Astar (3139), through the route of Ibrahim bin Khuthaym bin Arak bin Malik, from his father, from his grandfather, from Abu Hurairah, from the Prophet ﷺ, "Three whose supplication Allah is obligated not to reject, the fasting person until he breaks his fast, the wronged person until he is granted victory, and the traveler until he returns," this corroboration cannot be accepted, for Ibrahim bin Khuthaym bin Arak is matruk al-hadith (his narrations are abandoned).Further verification will follow in the Book of Supplications.