It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "There are three types of people whom Allah Almighty dislikes the most and who are most hateful to Him: one who commits heresy in the Sacred Sanctuary, one who seeks to revive the practices of ignorance in Islam, and one who strives to shed the blood of a person unjustly."