sin of 1 life 2 lives 7 past lives are removed with ekadasi fast and Haribodhini Ekadasi - 1000 lives

 Haribodhini Ekadasi from the Skanda Purana

Lord Brahma replied, “If a person eats once at midday on Ekadasi, the sins of his previous birth are erased, if he eats supper, the sins acquired during his previous two births are removed, and if he fasts completely, the sins accumulated during his pervious seven births are eradicated.

A person whose sins equal Mount Sumeru in volume sees them all reduced to nothing if he simply fasts on utthana  or Papaharini Ekadasi (another name for Haribodhini Ekadasi) sins of one hundred previous lives are erased. The sins a person has accumulated over a thousand previous births are burned to ashes if he not only

fasting on Haribodhini Ekadasi is a thousand times better than giving charity on the day of the solar or lunar eclipse. 

whatever merit is earned by one who bathes in a place of pilgrimage, performs sacrifices, and studies the Vedas is only one then-millionth the merit earned by the person who fasts but one on Haribodhini Ekadasi

Philosophical discussion of Scriptures in the month of Kartika pleases Sri Vishnu more than if one gives elephants and horses in charity or performs a costly sacrifice. Whoever chants or hears descriptions of Lord Vishnu’s qualities and pastimes, even if but a half or even a fourth of a verse, attains the wonderful merit derived from giving away a hundred cows to a brahmana

One who spends his time enjoying such discussions, especially in the month of Kartika, achieves the results of performing ten thousand fire sacrifices and burns all his sins to ashes.

O great sage, a person who chants the glories of Lord Hari on Ekadasi achieves the merit earned by donating seven islands.”

On Haribodhini Ekadasi one should worship Sri Krishna with camphor, fruits, and aromatic flowers, especially the yellow agaru flower

O king, those who have eaten supper on Ekadasi should feed a brahmana the next day. That is very pleasing to the Supreme Personality of Godhead.

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https://harekrishnacalendar.com/vaishnava-calendar/utthana-ekadashi-2024/#:~:text=Lord%20Brahma%20replied%2C%20%E2%80%9CO%20son,until%20fifty%20minutes%20before%20sunrise).