hadith
3861
۞
Imam al-Sadiq (AS) said, 'There are seven grave sins: intentionally killing a believer, falsely accusing a chaste woman of fornication, fleeing from the midst of a battle, returning to a state of renegation after belief [This includes apostasy as well as a mere return to ones previous state of heedlessness and complacency after having believed (ed.)], unjustly usurping the property of the orphan, devouring usury after knowledge of its prohibition, and everything else that Allah has threatened to requite with obligatory punishment in the Fire.
الإمامُ الصّادقُ (عَلَيهِ الّسَلامُ): الكبائرُ سَبعٌ: قَتلُ المؤمِنِ مُتَعَمِّداً ، وقذفُ المُحصَنَةِ ، والفِرارُ مِنَ الزَّحفِ ، والتَّعَرُّبُ بعدَ الهِجرَةِ ، وأكلُ مالِ اليتيمِ ظُلماً ، وأكلُ الرِّبا بعدَ البَيِّنَةِ ، وكُلُّ ما أوجَبَ اللّهُ عليهِ النارَ .