Ekadashi Vrat (fast) is one of the most significant rituals observed as per the Hindu Calendar. The word ‘Ekadashi’ has its roots in Sanskrit language, which means ‘Eleven’ and corresponds to the 11th day of every fortnight in Hindu Lunar Calendar. Every month two Ekadashi Tithis are observed, each in Shukla Paksha and Krishna Paksha.
As described in the Hindu Scriptures, Ekadashi Vrat lasts for almost 48 hours because the fast begins on the eve of Ekadashi and continues till Sun rises on the day after Ekadashi.
Ekadashi Mantra
Lord Vishnu mantra chanted during Ekadashi Puja is: 'Om Namo Bhagavate Vasudevaya'
It is also advised to chant Hare Krishna maha-mantra, 108 times. The mantra goes as: 'Hare Krishna Hare Krishna Krishna Krishna Hare Hare, Hare Rama Hare Rama Rama Rama Hare Hare or Hare Rama Hare Rama Rama Rama Hare Hare Hare,Hare Krishna Hare Krishna Krishna Krishna Hare Hare.
Devotees should also sing Ekadashi Mata Aarti, while performing their morning and evening prayers.