Hadith No: 1

Abu Tufail 'Amir b. Withila reported:

I was in the company of 'Ali b. Abi Talib, when a person came to him, and said: What was it that Allah's Apostle (s.a.w.a.) told you in secret? Thereupon he (liadrat 'All) was enraged and said: Allah's Apostle (s.a.w.a.) did not tell me anything in secret that he hid from people, except that he told me four things. He said: Com- mader of Faithful, what are these? He said: Allah cursed him who cursed his father; Allah cursed him who sacrificed for anyone besides Allah; and Allah cursed him who accommodates an innovator (in religion) ; and Allah cursed him who changed the minarets (the boundary lines) of the land.

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Reference: Saheeh Muslim Book 35 Tradition No. 60

Hadith No: 2
Ahmad ibn Hanbal - Musnad al-Imam Ahmad ibn Hanbal
And from the Musnad of the Banu Hashim - Beginnings of the Musnad of Abdullah ibn Abbas (ra)
Volume: (1) - Page Number: (217)
1878 - Muhammad ibn Salamah narrated to us, from Muhammad ibn Ishaq, from Amr ibn Abi Amr, from Ikrimah, from Ibn Abbas who said: The Prophet (peace be upon him and his holy progeny) said: "Cursed is the one who curses his father, cursed is the one who curses his mother, cursed is the one who sacrifices to other than Allah, cursed is the one who alters the boundaries of the earth, cursed is the one who blinds the deaf to the path, cursed is the one who commits bestiality, cursed is the one who acts like the people of Lot."

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Reference: Musnad Ahmad Ibn Hanbal Book 1