Abu Hurayrah (may Allah be pleased with him) said that the Prophet (peace and blessings be upon him) said: "Avoid the seven destroying sins." They said: What are they, O Messenger of Allah? He (peace and blessings be upon him) said: "Associating partners (with Allah), sorcery, killing someone unjustly, consuming usury (riba), consuming the wealth of the orphan, fleeing from battle, and slandering unaware, believing women."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحدود / 17128