The Ancient History of Mokshada  Ekadasi from Brahmanda Purana:
Yudhishthira Maharaj said, “O Vishnu, master of all, O delight of the three  worlds, O Lord of the entire Universe, O creator of the world, O oldest  personality, O best of all beings, I offer my most respectful obeisances unto  You.
“O Lord of lords, for the benefit of all living entities, kindly answer some  questions that I have. What is the name of the Ekadasi that occurs during the  light fortnight of the month of Margashirsha (November-December) and removes all  sins? How does one observe it properly, and which Deity is worshipped on that  holiest of days? O my Lord please explain this to me in full.”
Lord Sri Krishna replied, “O dear Yudhishthira, your enquiry is very auspicious  in itself and will bring you fame. Just as I previously explained to you about  the dearest Utpannaa Maha-Dwadasi – which occurs during the dark part of the  month of Margashirsha, which is the day when Ekadasi-devi appeared from My body  to kill the demon Mura, and which benefits everything animate and inanimate in  the three worlds – so I shall now relate to you regarding this Ekadasi that  occurs during the light part of the month of Margashirsha. This Ekadasi is  famous as Mokshadaa because it purifies the faithful devotee of all sinful  reactions and bestows liberation upon him. The worshippable Deity of this all  auspicious day is Lord Damodara. With full attention one should worship Him with  incense, a ghee lamp, fragrant flowers, and Tulasi manjaris (buds).
“O best of saintly kings, please listen as I narrate to you the ancient and  auspicious history of this wonderful Ekadasi. Simply by hearing this history one  can attain the merit earned by performing a horse sacrifice. By the influence of  this merit, one’s forefathers, mothers, sons, and other relatives who have gone  to hell can turn around and go to the heavenly kingdom. For this reason alone, O  king, you should listen with rapt attention to this narration.
“There once was a beautiful city named Champaka-nagar, which was decorated with  devoted Vaishnavas. There the best of saintly kings Maharaj Vaikhaanasa, ruled  over his subjects as if they were his very own dear sons and daughters. The  brahmins in that capital city were all expert in four kinds of Vedik knowledge.  The king, while ruling properly, had a dream one night in which his father was  seen to be suffering the pangs of hellish torture in one of the hellish planets  ruled over by the Yamaraj. The king was overwhelmed with compassion for his  father and shed tears. The next morning, Maharaj Vaikhaanasa described what he  had seen in his dream to his council of twice born learned brahmins.
” ‘ O brahmanas,’ the king addressed them, ‘in a dream last night I saw my  father suffering on a hellish planet. He was crying out in anguish, “O son,  please deliver me from this torment of this hellish condition !” Now I have no  peace in my mind, and even this beautiful kingdom has become unbearable to me.  Not even my horses, elephants, and chariots and my vast wealth in my treasury  that formerly brought so much pleasure, gives me no pleasure at all.
” ‘Everything, O best of the brahmins, even my own wife and sons, have become a  source of unhappiness since I beheld my father suffering the tortures of that  hellish condition so. Where can I go, and what can I do, O brahmins, to  alleviate this misery? My body is burning with fear and sorrow ! Please tell me  what kind of charity, what mode of fasting, what austerity, or what deep  meditation, and in service upon which Deity I may have to perform to deliver my  father from that agony and bestow upon liberation upon my forefathers. O best  among the brahmins, what is the use of one’s being a powerful son if one’s  father must suffer on a hellish planet? Truly, such a son’s life is utterly  useless, to him and to his forefathers.
” The twice born brahmins replied, ‘O king, in the mountainous forest not far  from here is the ashram where a great saint Parvata Muni resides. Please go to  him, for he is tri-kala-jnan (he knows the past, the present, and the future of  everything) and can surely help you in your gaining relief from your misery.’
“Upon hearing this advise, the distressed king immediately set out on a journey  to the ashram of the famous sage Parvata Muni. The ashram was indeed very big  and housed many learned sages expert in chanting the sacred hymns of the four  Vedas (Rg, Yajur, Sama, and Arthava). Approaching the holy ashram, the king  beheld Parvata Muni seated among the assembly of sages adorned with hundreds of  tilaks (from all the authorised sampradayas) like another Brahmaa or Vyaas.
“Maharaj Vaikhaanasa offered his humble obeisances to the muni, bowing his head  and then prostrating his entire body before him. After the king had seated  himself among the assembly Parvata Muni asked him about the welfare of the seven  limbs of his extensive kingdom (his ministers, his treasury, his military  forces, his allies, the brahmins, the sacrificial offerings performed, and the  needs of his subjects). The muni also asked him if his kingdom was free of  troubles and whether everyone was peaceful, happy and satisfied. To these  enquiries the king replied, ‘By your mercy O glorious and great sage, all seven  limbs of my kingdom are doing very well. Yet there is a problem that has  recently arisen, and to solve it I have come to you, O brahmana for your expert  help and guidance’.
“Then Parvata Muni, the best of all sages, closed his eyes and meditated on the  king’s past, present and future. After a few moments he opened his eyes and  said, ‘Your father is suffering the results of committing a great sin, and I  have discovered what it is. In his previous life he quarrelled with his wife and  forcibly enjoyed her sexually during her menstrual period. She tried to protest  and resist his advances and even yelled out, “Someone please save me! Please, O  husband, do not interrupt my monthly period in this way!” Still he did not stop  or leave her alone. It is on account of this grievous sin that your father now  has fallen into such a hellish condition of suffering.’
“King Vaikhaanasa then said, ‘O greatest among sages, by what process of fasting  or charity may I liberate my dear father from such a condition? Please tell me  how I can relieve and remove the burden of his sinful reactions, which are a  great obstacle to his progress toward ultimate release (salvation – liberation –  going back home).’
“Parvata Muni replied, ‘During the light fortnight of the month of Margashirsha  there occurs an Ekadasi called Mokshadaa. If you observe this sacred Ekadasi  strictly, with a full fast, and give directly to your suffering father the merit  you will thus attain/obtain, he will be freed from his pain and instantly  liberated’.
“Hearing this, Maharaj Vaikhaanasa profusely thanked the great sage and then  returned to his palace to perform his vrata (austere rite, austerity). O  Yudhishthira, when the light part of the month of Margashirsha at last arrived,  Maharaj Vaikhaanasa faithfully waited for the Ekadasi tithi to arrive. He then  perfectly and with full faith observed the Ekadasi fast with his wife, children,  and other relatives. He dutifully gave the merit from this fast to his father,  and as he made the offering, beautiful flower petals showered down from the  devas who peered out from behind the clouds in the sky. The king’s father was  then praised by the messengers of the demigods (devas) and escorted to the  celestial region. As he passed his son, as he traversed the lower to middle to  higher planets, the father said to the king, ‘My dear son, all auspiciousness  unto you!’
At last he reached the heavenly realm from where he can again with his newly acquired merit perform devotional service to Krishna or Vishnu and in due course return back to home back to Godhead.
“O son of Pandu, who so ever strictly observes the sacred Mokshadaa Ekadasi, following the established rules and regulations, achieves full and perfect liberation after death. There is no better fasting day than this Ekadasi of the light fortnight of the month of Margashirsha, O Yudhishthira, for it is a crystal-clear and sinless day. Whoever faithfully observes this Ekadasi fast, which is like chintaa-mani (a gem that yields all desires), obtains special merit that is very hard to calculate, for this day can elevate one from hellish life to the heavenly planets, and for one who observes Ekadasi for his own spiritual benefit, this elevates one to go back to Godhead, never to return to this material world.”
Thus end the narration of the glories of Margashirsha-shukla Ekadasi or Mokshada Ekadasi, from the Brahmanda Purana.
These stories have been summarised and slightly changed or abbreviated from how they are found in the celebrated book, “Ekadasi: The Day of Lord Hari” 1986. HH Krishna Balaram Swami. Bhaktivedanta Institute Press.IndirA EkAdasii – from the Brahma-vaivarta PurANa.
Note: Special thanks to Jaya Tirtha Caran prabhu from NZ for allowing us to use some of the content from his site to compile these pages.