Abu Ad-Dardā' (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "When a person curses something, the curse ascends to heaven and the gates of heaven are closed against it. Then it descends to earth and its gates are closed against it. Then it turns right and left and when it finds no exit it returns to what was cursed if it deserves to be cursed; otherwise, it rebounds to the one who uttered it." Authentic hadith - Narrated by Abu Daoud
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