Answer

According to commonly accepted Jain tradition, Paryushan as a formal festival in the present form is not clearly described as being celebrated in Bhagwan Rushabhdev’s era.

So the accurate answer is:

Sorry, I can only provide information that is clearly established within Jain tradition.

Explanation

Bhagwan Rushabhdev, the first Tirthankar of the present Avasarpini kaal, established the fourfold Jain Sangh and taught the path of restraint, non-violence, renunciation, and liberation.

However, the specific yearly observance known today as Paryushan Parva, with its present structure such as:

• Pratikraman
• Kalpa Sutra reading in Shwetambar tradition
• Das Lakshan observance in Digambar tradition
• Samvatsari Pratikraman and Michchhami Dukkadam

is not clearly established as having existed in the same form during Bhagwan Rushabhdev’s time.

Spiritual Understanding

Even if the exact festival form is not clearly confirmed for Rushabhdev Bhagwan’s era, the spirit of Paryushan is fully aligned with the teachings of all Tirthankars:

• Ahimsa
• Self-discipline
• Forgiveness
• Repentance
• Tapasya
• Purification of the soul

These values are eternal in Jain Dharma and were taught by every Tirthankar.

Takeaway

We should not say with certainty that Paryushan was celebrated in Bhagwan Rushabhdev’s era in the same way as today. But its inner purpose—self-purification, forgiveness, and spiritual awakening—is completely rooted in the teachings of all Tirthankars.