Abu Bakrah narrated that the Messenger of Allah (s.a.w) said:
"There is no sin more worthy of Allah hastening the punishment upon its practitioner in the world – along with what is in store for him in the Hereafter – than tyranny and severing the ties of kinship." (Sahih)
English reference: Vol. 4, Book 11, Hadith 2511
Arabic reference: Book 37, Hadith 2700