Sahaba who have cursed each others.

1) Mullah Ali Qari has said that Abu Hanifa has cursed the Amraw ibne Ubaid .

Ref:     Sharh Fiqh Akber  Pg 43.

2) Uthman refrained to give Aisha any money by reminding her that she was one of those who testified and encouraged Abu-Bakr to refrain to pay the share of inheritance of Fatimah (AS). So if Fatimah does not have any share of inheritance, then why should she? Aisha became extremely angry at Uthman, and came out saying:

"Kill this old fool (Na'thal), for he is unbeliever."

Lanat (Curse) in Ziyarat

Zyarat-e-Ashura : “Oh Aba Abdullah! I  seek nearness to Allah(swt) and to Holy Prophet(SAWA) and to Amirul momineen(AS)  and to Fatema zehra(swt) and to Imam Hasan(AS) and to you  by loving you and by dissociating from those who killed you and from him who laid the foundation to fight with you, and by distancing from those who laid the foundation of oppression upon you .Again I seek nearness to Allah and to

Meaning of Curse

Lanat or Laa'an, the word العن literally means in English 'anathematize' (.ie: a ban or curse solemnly pronounced by ecclesiastical authority and accompanied by excommunication; this is the closest meaning in English) or more commonly 'curse'.

Curse from Shia Point of View

Cursing AbuBakr And Umar:-

1) Hanan Ibn Sadir narrated:

I asked Imam al-Baqir (AS) about these two (That is Umar and AbuBakr). He(AS) replied: "O Aba al-Fadhl! Do not ask me about them for, by Allah, non among us (Ahlul-Bayt) would die except that he is displeased with those two. No day passes to us except that we are angry with them. Indeed, they oppressed

Curse from Sunni Point of View

1) Janabe Fatema Zehra(SA) was angry with Abubakr and used to curse him and did not talk to him till her death .

Ref :    Sahih Bukhari Kitab Magazi Bab Guzwwe Khaiber V 3  Pg 55.

2) The Proof of Sending Curses(Lanat) on Yazid!

The Proof of sending Lanat upon Yazid is derived from this (ayah), as was mentioned by Al-Barzanji  in his Al-Ashaat and Imam Haythami I in As-Sawaiq from Imam Ahmed  that his son Abdullah asked him about sending Lanah on Yazid, and how sending Lanah upon him is mentioned in the book of Allah (i.e. Quran).

Curse in Holy Quran

Holy Quran and Lanat (Curse)

Quranic Verses can be divided into four parts.

1. Curse on Iblis.

‘And surely on you is curse until the Day of Judgment.’                                       
(Surah Hijr, 15:35)

‘And surely My curse is on you until the Day of Judgment.’                              
 (Surah Suad, 38:78)

Allah has cursed Iblis. (i.e. He has made him far from His Mercy.) When Iblis was cursed, he said to Allah, ‘I will certainly have a special share from Your servants.’