In Jain Dharma, passing gas by itself is a natural bodily function and is not something you need to “repent” for.

What matters is:

• Intention: if it happened naturally, there is no sinful intent.
• Ahimsa and decorum: if possible, try to avoid causing discomfort to others.
• Self-restraint: maintain cleanliness, modesty, and mindfulness.

If it was intentional to disturb, insult, or be careless in a way that harms others’ peace, then one should feel pratikraman-bhav: regret, self-awareness, and a resolve to be more careful.

So, in general: no repentance is needed for a natural bodily function. A gentle awareness and apology if it disturbed someone is enough.