In Jainism, "Parna" refers to the ceremonial breaking of a fast, especially after observing a long fast such as "Varsitap" (a year-long austerity). Bhagwan Rushabhdev (also known as Adinath) is the first Tirthankara in Jain tradition. According to Jain scriptures, Rushabhdev performed a long period of austerity and fasted until he received his first alms (Ikshu Ras or sugarcane juice) from his great-grandson Shreyans Kumar, which marks the first Parna in Jain history.

Jain communities often sing devotional songs (bhajans) and stavans to celebrate this event. Here is a popular traditional stavan (devotional song) often sung on the occasion of Rushabhdev's Parna:

"Ikshu Ras Piyo Re Adinath" (इक्षु रस पियो रे आदिनाथ)

Ikshu ras piyo re Adinath, Dukh haran re Adinath... Varsitap kari parna kiya, Mangal gun gayo re Adinath...

Translation (summary): "O Adinath! You drank sugarcane juice, remover of suffering, O Adinath! After performing Varsitap, you took parna, Your auspicious virtues we sing, O Adinath!"

You can find many such stavans and bhajans in Jain songbooks or on Jain community websites and YouTube channels by searching for "Rushabhdev Parna stavan" or "Adinath Parna bhajan".

If you are looking for the lyrics of a specific song, please provide more details and I can try to help you further.