We do not know of any source for the hadith which reads: “Whoever offers congratulations to people for this blessed month (i.e. Rabi` al-Awwal), the Fire will be forbidden for him”, and it is clearly fabricated.

The words mentioned in this hadith about lying are not from the Prophet (blessings and peace of Allah be upon him). Therefore, it is not permissible to attribute this to the Messenger of Allah (blessings and peace of Allah be upon him). The basic principle is that zina is worse than telling lies