Musnad Ahmad 25:1055

Ya'qub narrated to us, my father narrated to us, from Ibn Ishaq, who said: 'Amr ibn Abi 'Amr, the freed slave of Al-Muttalib, narrated to us, from 'Ikrimah, from Ibn 'Abbas, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Cursed is he who curses his father; cursed is he who curses his mother; cursed is he who slaughters for other than Allah; cursed is he who alters the boundaries of the land; cursed is he who misleads a blind person from the path; cursed is he who has intercourse with an animal; cursed is he who does the deed of the people of Lot." The Messenger of Allah (may Allah bless him and grant him peace) said this three times regarding the one who commits the act of Lot.