Answer

In Jain Dharma, if a promise is broken, the main tapasya is prāyaścitta — sincere repentance and atonement.

A suitable approach is:

• Accept the mistake honestly without hiding or justifying it.
• Do ālochana — confess the mistake sincerely before a Guru, if possible.
• Do pratikraman with true repentance.
• Ask forgiveness from the person affected, if appropriate.
• Take a firm resolve not to repeat the mistake.
• Do tapasya according to your capacity, such as ekāsana, biyāsana, upvās, or extra samayik.

Explanation

In Jainism, breaking a promise is connected with lack of truthfulness and carelessness in conduct. The purpose of tapasya is not punishment, but purification of the soul.

The most important thing is the inner feeling:

• repentance for the mistake,
• humility,
• forgiveness,
• and a sincere effort not to repeat it.

If you have access to a Jain Guru, it is best to ask them directly, because they can guide the proper prāyaścitta according to the seriousness of the promise and your personal capacity.

Spiritual Understanding

Jain Dharma teaches that mistakes should be corrected through awareness, humility, and self-discipline. A broken promise should become a reason to strengthen:

• satya — truthfulness,
• saṃyam — self-control,
• apramatta bhāv — carefulness in conduct.

Takeaway

Do sincere pratikraman, seek forgiveness, take a strong resolve, and perform tapasya within your strength. The most important tapasya is a pure heart that truly decides: “I will not repeat this mistake.”