Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "Avoid the seven destructive sins." It was asked: O Messenger of Allah! What are they? He (peace and blessings be upon him) said: "Associating partners with Allah, practising magic, killing unjustly, consuming usury (riba), consuming the wealth of an orphan, fleeing from the battlefield, and slandering chaste, unsuspecting women."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنايات / 15851