The Prophet (blessings and peace of Allah be upon him) said:
“Avoid the seven sins that doom a person to Hell.” We said: What are they, O Messenger of Allah? He said: “Associating others with Allah (shirk); witchcraft; killing a soul whom Allah has forbidden us to kill, except in cases dictated by Islamic law; consuming orphans’ wealth; consuming riba; fleeing from the battlefield; and slandering chaste, innocent women.”
Bukhari and Muslim