When people ask about a major vow during Kartik Maas, they are almost always referring to Bhishma Panchak (often colloquially called Bhishma Vrata), rather than a vow dedicated to the Pandava prince Bhima.
While Bhima Vrata (Bhima Dwadashi) occurs in the month of Magha, the final five days of Kartik are globally celebrated in the Vaishnava tradition as the Bhishma Panchaka Vrata or Vishnu Panchaka.
The Origin & Legend
The vow traces its roots to the aftermath of the Kurukshetra War in the Mahabharata.
Grandfather Bhishma, pierced by countless arrows, utilized his boon of Ichcha Mrityu (the ability to choose the time of his death) to wait for the auspicious Uttarayana period. As he lay on the bed of arrows (Shara Shayya), Lord Krishna brought the Pandavas to him to receive his final teachings on Dharma (which includes the revelation of the Vishnu Sahasranama).
Bhishma fasted and performed intense austerities during the final five days of the Kartik month. Lord Krishna was so profoundly moved by Bhishma’s devotion that He declared these five days would forever be known as Bhishma Panchak. The Lord promised that anyone who fasts and performs devotional service during this period will attain immense spiritual merit and pure devotion (Bhakti).
The Observance (Vrata Vidhana)
The Bhishma Panchak is observed during the last five days of Kartik, starting on Prabodhini Ekadashi (Devutthana Ekadashi) and concluding on Kartik Purnima.
According to texts like the Padma Purana and the Hari Bhakti Vilasa, this vow grants the accumulated merit of observing the entire month of Kartik. Practitioners choose a fasting level based on their physical capacity:
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Level 1 (The Strictest): The practitioner consumes nothing but water or the five sacred products of the cow (Panchagavya)—one specific product for each of the five days.
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Level 2 (Phalahar): The practitioner abstains entirely from all grains and beans, subsisting only on fruits, roots (like sweet potatoes and regular potatoes), and milk.
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Level 3 (Havishya): The practitioner eats a simple, unspiced, single meal of boiled rice and specific vegetables (like raw banana and taro root) once a day in the evening.
During these five days, the primary spiritual duty is to avoid material distractions, chant the names of Lord Vishnu or Krishna (such as the Hare Krishna Mahamantra), and offer a ghee lamp (Deepa Daan) every evening.