In the olden days, anybody who had to enter the city of Dwaraka, had to display the symbols of Vishnu viz Shankha and Chakra embossed on his body, thereby declaring that he/she was a Vaishnava!!
In the olden days, anybody who had to enter the city of Dwaraka, had to display the symbols of Vishnu viz Shankha and Chakra embossed on his body, thereby declaring that he/she was a Vaishnava!!