Mbh 3.91.1b

And he hath also thoroughly learnt music, both vocal and instrumental, and dancing and proper recitation of the Saman (Veda) from Vishwavasu’s son. And having thus acquired weapons and mastered the Gandharva Veda, thy third brother Vibhatsu liveth happily (in heaven). Listen to me, O Yudhishthira, for I shall now deliver to thee the message of that foremost of celestials. He hath commanded me saying, “Thou wilt, no doubt, go to the world of men. O best of Brahmanas, tell thou Yudhishthira these words of mine. Soon will thy brother Arjuna come to thee, having acquired arms and accomplished a great deed for the celestials that is incapable of being accomplished by themselves. Do thou meanwhile devote thyself to ascetic austerities, with thy brothers. There is nothing superior to asceticism, and it is by asceticism that a person achieveth great results. And, O bull of the Bharata race, well do I know that Karna is endued with great ardour and energy and strength and prowess that is incapable of being baffled. Well do I know that, skilled in fierce conflict, he hath not his rival in battle; that he is a mighty bowman, a hero deft in the use of fierce weapons and cased in the best of mail. Well do I know that that exalted son of Aditya resembleth the son of Maheswara himself. Well do I also know the high natural prowess of the broad-shouldered Arjuna. In battle Karna is not equal unto even a sixteenth part of Pritha’s son. And as for the fear of Karna which is in thy heart, O repressor of foes, I shall dispel when Savyasachin will have left heaven. And as regards thy purpose, O hero, to set out on a pilgrimage to tirthas, the great Rishi Lomasa will, without doubt, speak unto thee. And whatever that regenerate Rishi will relate unto thee touching the merits of asceticism and tirthas, thou shouldst receive with respect and not otherwise!’”