In Jainism, there is a clear concept of purva bhav (past lives) for souls, but the name “Arjun” does not feature as a canonical figure in Jain scriptures. So there isn’t a Jain canonical discussion titled “Arjun purva bhav.” If you meant the general idea of a soul’s past lives, I can explain how Jain texts describe purva bhav and give authentic examples (like the past lives of Tirthankaras or other liberated beings) in a simple way.