The ill-gotten gains are really obstacles. When people are used to gaining ill-gotten things they become unwilling to worship. There are so many jobless people in the streets. And at the time of prayers when the call «Come to the prayer», (حىّ على الصلاة), «Hurry to the best work», (حىّ على خيرالعمل) are heard from the mosques few people are willing to attend the congregational prayers, and when one person suggests attending the congregational prayers, they say that they don’t feel like participating the prayers. Our Prophet has said: when the congregational prayers exceed ten people then the Jinn and humankind are not able to count the rewards.
source : erfan.ir