The narrator asked Imam Ja’far Sadiq (a.s.), “O Master! How is it possible that a person goes to Paradise because of a house fly and another into Hell because of it?” Imam (a.s.) replied, “These two persons went to a tribe, which was celebrating a feast on that day. That tribe had an idol and none was allowed to go near it without offering a sacrifice. However there was no restriction on the size of sacrifice. The tribe refused to permit them passage unless they offered a sacrifice. One of those two persons said that he didn’t have anything to sacrifice. Then he caught a fly, killed it and offered it as a sacrifice while other companion refused to sacrifice even a fly for the sake of anyone except Allah. The tribal people killed him and he entered Paradise. On the other hand, the person who was left alive got punished in Hell.”