Legend regarding Karni Mata Temple is very interesting. Historical facts of the temple relate that Karni was incarnated as “Devi” during her life-time. Karni, according to the prevalent legend, was the sixth daughter of a Charan named Meha. The Charans sing elegies and genealogies of the kings. All the daughters of Meha are worshipped out of religious deference, while Karni attracts the upper class, the other sisters namely, Lai Bai and Phool Bai are revered by the scheduled caste people. At the age of 27, Karni was married to one Deepa of Marwar, but the marriage was dissolved soon, and since then Kami adorned the clothes of a ‘sanyasin’ and devoted her life to the uplift and service of the poor. According to a legend, Karni breathed her last in an unusual way. She evaporated in a flash of fire. Since then she has been regarded as an incarnation of ‘Shakti’. The rats numbering about twenty thousand, spread in the premises of temple, are of special variety, called as ‘kabas’. They never mix up with other rats outside the temple precincts. In 1927 A.D. when plague was raging everywhere in the State, there was not a single case of the disease inside the temple. The worship in the temple is of ‘Shakti’ and not of Kaba, the vahan (vehicle) of the Goddess.
Karni Mata Temple, also called the temple of Deshnoke, was constructed with white marble in simple architectural style. The inner gates are of gold. Funds for the temple are provided by presents of the rulers of Bikaner and by the offerings of the devotees. The ‘puja’ (worship) ceremonies are performed by the Charan Brahmins of the Karni’s clan. The main attraction of the temple is the congregation and movements of the rats. There is a regular budget to feed these rats with milk and sweets. Sufficient staff is employed to avoid depredations by cats and other animals. To protect them from the enemy, copper nets in the premises are also laid. Visitors are warned to be careful while moving in the temple. A rat of gold has to be presented to the temple in return for a rat killed by any person.