It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The major sins are seven: associating partners with Allah, unjustly killing a soul whom Allah has made sacred, slandering a chaste woman, fleeing from the battlefield, consuming usury (riba), consuming the wealth of an orphan, and returning to the Bedouin life after emigration (hijrah)."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) only with this chain; Abu Bilal is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 5709
Hadith Gradingمحدثین:إسناده ضعيف لضعف أبي بلال الأشعري
Hadith Takhrij«قال الهيثمي: فيه أبو بلال الأشعري وهو ضعيف «مجمع الزوائد ومنبع الفوائد، ج 1، ص 104»»