In Jainism, "Athai Sham ka Pachkan" refers to the ritual of taking a vow or resolve (pachkan) for observing a fast of eight meals (Athai). "Athai" (अठाई) means a specific type of fasting where a devotee abstains from eating for a period that covers eight consecutive meals, which typically means about four days (as Jains usually have two meals a day).

The "Pachkan" is the formal statement or prayer recited to mentally and spiritually commit oneself to this observance. It is generally taken in the presence of a Jain monk, nun, or sometimes before an image of a Tirthankara.

Purpose of Athai Sham ka Pachkan:

• To purify the soul through austerity (tapas).
• To reduce attachment to food and bodily pleasures.
• To accumulate punya (spiritual merit) and destroy karmic bondage.

Typical Pachkan Statement: While the exact words may vary by tradition (Shwetambar or Digambar), the essence is:

"I take the vow to observe Athai, abstaining from food for eight consecutive meals, with the intention of spiritual purification, and following all the rules of Jain fasting. May I refrain from all sinful activities during this period."

How it is performed:

1. The devotee performs the ritual of samayik (meditation/equanimity).
2. They recite the pachkan in the presence of a spiritual mentor or in front of a Tirthankara idol.
3. They formally resolve not to eat for the next eight meals.
4. They maintain purity of mind, speech, and body throughout the period.

After the Fasting: Once the Athai is completed, the person performs "parna" (breaking the fast) with proper rituals, often with boiled water or light food.

If you want the pachkan in a specific language (like Hindi, Gujarati, or Sanskrit), please let me know.