كتاب الإيمان
1
The Book of Faith
(38)
Chapter: The major sins and the most serious of them
(38)
باب بَيَانِ الْكَبَائِرِ وَأَكْبَرِهَا ‏‏

It is reported on the authority of Abu Huraira that the Messenger of Allah (ﷺ) observed:

Avoid the seven noxious things. It was said (by the hearers): What are they, Messenger of Allah? He (the Holy Prophet) replied: Associating anything with Allah, magic, killing of one whom God has declared inviolate without a just cause, consuming the property of an orphan, and consuming of usury, turning back when the army advances, and slandering chaste women who are believers, but unwary.
حَدَّثَنِي هَارُونُ بْنُ سَعِيدٍ الأَيْلِيُّ، حَدَّثَنَا ابْنُ وَهْبٍ، قَالَ حَدَّثَنِي سُلَيْمَانُ بْنُ بِلاَلٍ، عَنْ ثَوْرِ بْنِ زَيْدٍ، عَنْ أَبِي الْغَيْثِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ اجْتَنِبُوا السَّبْعَ الْمُوبِقَاتِ ‏"‏ ‏.‏ قِيلَ يَا رَسُولَ اللَّهِ وَمَا هُنَّ قَالَ ‏"‏ الشِّرْكُ بِاللَّهِ وَالسِّحْرُ وَقَتْلُ النَّفْسِ الَّتِي حَرَّمَ اللَّهُ إِلاَّ بِالْحَقِّ وَأَكْلُ مَالِ الْيَتِيمِ وَأَكْلُ الرِّبَا وَالتَّوَلِّي يَوْمَ الزَّحْفِ وَقَذْفُ الْمُحْصَنَاتِ الْغَافِلاَتِ الْمُؤْمِنَاتِ ‏"‏ ‏.‏
Reference : Sahih Muslim 89
In-book reference : Book 1, Hadith 168
USC-MSA web (English) reference : Book 1, Hadith 161
  (deprecated numbering scheme)