Curse Comes Back

Rasul Allah (sal Allahu alaihi wa sallam) said: “When a servant curses something, the curse rises up to the sky, where the doors of the sky shut it out, and then it falls back to earth, where the doors of the earth shut it out. Then it searches right and left and when it does not find anywhere to go it comes back to the thing which was cursed, should it deserve it. If not, it returns upon the person who uttered it.” [Abu Dawud]

Cursing someone who does not deserve it is a major sin (kaba’ir/enormity). An undeserved curse returns to the one who uttered it. Thus, we should be very careful and guard our tongues vigilantly.