Among all twelve months, the month of Karttika is dear to Lord Sri Krishna. if somebody performs a little worship of Lord Sri Hari in this month, he offers that devotee his own abode.
There is no other month equal to Karttika. There is no other scripture equal to vedas. There is no other place of pilgrimage equal to Ganges, therefore, the month of karttika is very dear to the vaisnavas (people dedicated to Vishnu).
Those brahmanas who do not give charity in the month of Karttika, perform sacrifice, chant japa and fast for Lord Hari are the lowest of mankind.
Any person who tries to observe a Karttika month without following rules and regulations properly, Lord Sri Krishna remains against them because this month (karttika) is very pleasing to him.