“Once I asked Abu ‘Abdillah (a.s.) about the major sins. The Imam said, ‘They according to the book of Ali (a.s.) are seven:
Disbelief in Allah,
Murdering a soul,
Disregard of good relations with parents,
Consuming unlawful interest from trade with evidence,
Consuming the properties of orphans unjustly,
Running away from the enemy in battlefield during an offensive,
and Alienation from religion after emigration (apostasy).’
I (the narrator) then asked, ‘Are these the biggest sins?’ The Imam said, ‘Yes, they are.’ I then asked, ‘Is consuming one dirham from the property of an orphan unjustly a bigger sin or disregarding the prayer?’ The Imam said, ‘Disregard of the prayer is a bigger sin.’ “I then said, ‘You did not mention disregard of prayer among the major sins.’ The Imam said, ‘What was the first item that I mentioned to you?’ I said, ‘It was disbelief in Allah.’ The Imam said, ‘One who disregards prayer is an unbeliever (that is, he is considered as such for ignoring prayer without reason?)”’