Consuming carrion, pork and blood and all those things on which Allah (S.w.T.)’s name has not been invoked during its slaughter are greater sins as reported by Amash from Imam Ja’far as-Sadiq (a.s.) and Fazl ibn Shazān from Imam ‘Ali Riďa (a.s.). This fact is also mentioned in the Qur’an in Surah al-Baqarah Verse 173, Surah al-An’ām Verse 145 and Surah an-Nahl Verse 116.