They ask you concerning the new moon. Say: They are times appointed for (the benefit of) men, and (for) the pilgrimage; and it is not righteousness that you should enter the houses at their backs, but righteousness is this that one should guard (against evil); and go into the houses by their doors and be careful (of your duty) to Allah, that you may be successful.

And if We hold back from them the punishment until a stated period of time, they will certainly say: What prevents it? Now surely on the day when it will come to them, it shall not be averted from them and that which they scoffed at shall beset them.