Allah, the Exalted, says:

"No doubt! the Curse of Allah is on the Zalimun (polytheists, wrongdoers, oppressors).'' (11:18)

"Then a crier will proclaim between them: `The Curse of Allah is on the Zalimun (polytheists and wrongdoers).''' (7:44)

It has been authentically reported that the Messenger of Allah said, "Curse of Allah is upon those women who wear false hair, and those women who prepare such.'' And he (PBUH) said, "Curse of Allah is upon the one who eats Riba (usury).'' And he also cursed the painters of pictures of living objects. And he (PBUH) said, "Curse of Allah is upon him who make changes in land boundaries (to deprive others).'' He (PBUH) also said, "Curse of Allah is upon the thief who steals (even) an egg.'' He also said, "Curse of Allah is upon the one who curses his parents.'' And: "Curse of Allah is upon the one who sacrifices an animal for other than Allah.'' And he (PBUH) said, "Who invents heresies in religion here (Al-Madinah), and upon those who supported him, is the Curse of Allah and the angels and all the people.'' And he (PBUH) said, "O Allah! Curse be upon Ri`l, Dhakwan and Usaiyyah, the three tribes of Arab who are disobedient to Allah and His Messenger.'' He also said, "Curse of Allah is upon the Jews who turned the graves of their Prophets into places of worship.'' And he (PBUH) cursed those men who imitate women and those women who imitate men.

All these Ahadith are authentic, and are reported by Al-Bukhari or Muslim or by them both. These Ahadith will be cited under their respective chapters, In sha' Allah.