577. Commandment – the postponement of a Sacred Month is an addition to disbelief
[9:37] Surely, the postponement of a Sacred Month is an addition to disbelief. Those who disbelieve are led astray thereby. They allow it one year and forbid it another year, that they may agree in the number of the months which Allah has made sacred, and thus may make lawful what Allah has forbidden. The evil of their deeds is made to seem fair to them. And Allah guides not the disbelieving people.