Silsilah as-Sahihah 3110 — The supplication of the oppressed

It is narrated from Sayyiduna Khuzaymah bin Thabit (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Beware of the supplication of the oppressed, for it is raised above the clouds (i.e., it is accepted immediately). Allah Almighty says: By My honor and by My majesty! I will surely help you, even if it is after some time."