When the five Pandavas were living together with their wife Draupadi, they had an arrangement,that Draupadi shall live as wife together with one of the Five and the other four Pandvas shall not be with her.
At a point of time, Yudhistrawas living with Draupadi.
Arjuna,being a Kshatriy and a King, could not but to accede to Agni’s request.
Without knowing who Agni was and what his hunger was for, Arjuna agreed and was shocked to know it was Agni and his hunger was for burning down the Kanadava Forest.
He was in a dilemma for as a King he(Prince) he had a duty to protect forests with the animals living in it.
He consulted(who else?) Lord Krishna,who told him as a King and Kshatriya it was his duty to fulfill his promise .
( Krishna had a hidden agenda.
He knew that a great war will ensue , that Arjuna did not have a powerful Bow and he waned Arjuna to possess one.
He engineered the whole event though Indra,father of Arjuna.)
As anticipated by Krishna Agni asked Vauna to give the best bow and he gave the Kandeeva to Arjuna.
Arjuna burnt the forest.
Agini gave him the Agneyastra as well.
When Arjuna came Home to take his old bow and arrows,he unintentionally saw Yudihistra and Draupadi together.
It is considered to be a sin to see man and wife together when they are intimate,Sastras declare and one has to atone for this,Prayaschitta.
One of the Prayascitta was going on a Pilgrimage.
Krishna advised the Prayaschitta of Pilgrimage as He wanted Arjuna to get the help of as many Kings as possible for the Mahabharata war(Arjuna was not aware of the fact).
Arjuna went on a Pilgrimage of India and in the process married many a princesses,including the daughter of a Pandya king-the Pandya fought the war along with the Panadvas.
Vyasa gives a detailed description of the route taken by Arjuna during the Pilgrimage.
This is the route taken by Arjuna.
Mbh.1.215:- Followed by Brahmanas conversant with the Vedas and their branches and devoted to the contemplation of the Supreme Spirit, by persons skilled in music, by ascetics devoted to the Deity, by reciters of Puranas, by narrators of sacred stories by devotees leading celibate lives, by Vanaprasthas, by Brahmanas sweetly reciting celestial histories, and by various other classes of persons of sweet speeches, Arjuna journeyed. He saw many delightful and picturesque forests, lakes, rivers, seas, provinces, and waters in his journey. At length, on arriving at the source of theGanges the mighty hero thought of settling there.
After leaving his city viz. Indraprastha, Arjuna finally reaches the source of Ganga. It was also known as Gangadwara (Haridwar). There Arjuna metUlupi, the daughter of a Naga king who belonged to the Kauravya branch of the Airavata Nagas. His palace seems to be at Nagal, very close toRishikesh. Arjuna went to the palace of Kauravya and spent one night with Ulupi. (Their union resulted in the birth of a great Naga warrior by the name Iravat. The name indicate that he belonged to the Airavata Naga race.) In the next day morning Ulupi took back Arjuna to Gangadwara and left him there.
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