Mahabharata Aswamedha Parva Chapter 81:2

Mahabharata Aswamedha Parva (Anugita Parva) Chapter 81:2 He will, standing on the field of battle, cast Dhananjaya down on the Earth. When this will happen, O prince of snakes, Arjuna will be freed from our curse. Do thou go back.'—Thus addressed by the Vasus, he came back and informed me of what had happened. Having learnt all this, O hero, I have freed thee from the curse of the Vasus even in this way. The chief of the deities himself is incapable of vanquishing thee in battle. The son is one's own self. It is for this that thou hast been vanquished by him. I cannot be held, O puissant one, to have committed any fault. How, indeed, wouldst thou hold me censurable?"—Thus addressed (by Ulupi), Vijaya became cheerful of heart and said unto her, "All this that thou hast done, O goddess, is highly agreeable to me." After this, Jaya addressed his son, the ruler of Manipura, and said unto him in the hearing of Chitrangada, the daughter (-in-law) of Kuru's house, "the Horse-sacrifice of Yudhishthira will take place on the day of full moon in the coming month of Chaitra. Come there, O king, with thy mother and thy counsellors and officers. Thus addressed by Partha, king Vabhruvahana of great intelligence, with tearful eyes, said these words to his sire, "O thou that art conversant with every duty, I shall certainly repair, at thy command, to the great Horse-sacrifice, and take upon myself the task of distributing food among the regenerate ones. For, however, showing thy grace towards me, thou enter thy own city with thy two wives. Let no scruple be thine as regards this, O thou that art fully acquainted with every duty. O lord, having lived for one night in thy own mansion in happiness, thou mayst then follow the steed, O foremost of victorious warriors." The ape-bannered son of Kunti, thus addressed by his son, answered the child of Chitrangada, saying "Thou knowest, O mighty-armed one, what vow I am observing. O thou of large eyes, till the termination of this my vow, I cannot enter thy city. O foremost of men, this sacrificial horse wanders at will. (I have to follow it always.) Blessings on thee! I must go away. Place I have none wherein to rest for even a short while." The son of the chastiser of Paka then, duly worshipped by his son and obtaining the permission of his two wives, left the spot and proceeded on his way.