question #1 Sahih Muslim 677a, Book 5, Hadith 378 : What is the significance of invoking curses in Islam, and under what circumstances is it considered appropriate?

Allah the Exalted and Great revealed (a verse) regarding those who were killed at Bi’r Ma’una, and we recited it, till it was abrogated later on (and the verse was like this):, convey to it our people the tidings that we have met our Lord, and He was pleased with us and we were pleased with Him”.