Mbh 14.79.1a

"Vaisampayana said, 'The ruler of Manipura, Vabhruvahana, hearing that his sire Arjuna had arrived within his dominions, went out with humility, with a number of Brahmanas and some treasure in his van.[194] Remembering, however, the duties of Kshatriyas, Dhananjaya of great intelligence, seeing the ruler of Manipura arrive in that guise, did not approve of it. The righteous-souled Phalguna angrily said, "This conduct of thine is not becoming. Thou hast certainly fallen away from Kshatriya duties. I have come here as the protector of Yudhishthira's sacrificial horse. Why, O son, wilt thou not fight me, seeing that I have come within thy dominions? Fie on thee, O thou of foolish understanding, fie on thee that hast fallen away from Kshatriya duties! Fie on thee that would receive me peacefully, even though I have come here for battling with thee. In thus receiving me peacefully thou actest like a woman. O thou of wretched understanding, if I had come to thee, leaving aside my arms, then would this behaviour of thine have been fit, O worst of men." Learning that these words were addressed by her husband, the daughter of the Snake-king, viz., Ulupi unable to tolerate it, pierced through the Earth and came up to that spot.[195] She beheld her son standing there perfectly cheerless and with face hanging down. Indeed, the prince was repeatedly rebuked by his sire who was desirous of battle with him, O monarch. The daughter of the snake, with every limb possessed of beauty, viz., Ulupi, said these words consistent with righteousness and duty unto the prince who was conversant with righteousness and duty,--"Know that I am thy mother Ulupi that am the daughter of a snake. Do thou accomplish my behest, O son, for thou wouldst then attain to great merit. Fight thy father, this foremost one of Kuru's race, this hero that is irresistible in battle. Without doubt, he will then be gratified with thee."