The intercalation (of sacred months) is an act of gross infidelity which causes the unbelievers to be led further astray. They declare a month to be lawful in one year and forbidden in another year in order that they may conform to the number of months that Allah has declared as sacred, and at the same time make lawful what Allah has forbidden. Their foul acts seem fair to them. Allah does not direct those who deny the Truth to the Right Way.