This is another article in the chapter Enormities from the classical manual on Sharia called Reliance of the Traveller. The articles are posted one by one in the order they are given in the book.
p39.0 CURSING OTHERS (dis: r38)
p39.1 The Prophet (Allah bless him and give him peace) said:
(1) “Cursing a believer is like killing him.”
(2) “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. H not, it returns upon the person who uttered it.”
(3) While the Prophet (Allah bless him and give him peace) was on a journey, there was a woman of the Medinan Helpers (Ansar) riding a camel which annoyed her, whereupon she cursed it. The Prophet heard this and said, “Take off what is on its back and release it, for it has been cursed.” And it is as if I can still see it now, walking along among the people, no one stopping it.