Sahih Bukhari Volume 9, Book 83, Hadith Number 21.

Narrated By Ibn ‘Abbas : The Prophet said, “The most hated persons to Allah are three:

1. A person who deviates from the right conduct, i.e., an evil doer, in the Haram (sanctuaries of Mecca and Medina);
2. A person who seeks that the traditions of the Pre-lslamic Period of Ignorance, should remain in Islam
3. And a person who seeks to shed somebody’s blood without any right.”