Mbh 7.80.1a

“Sanjaya said, ‘Kunti’s son, Dhananjaya, of inconceivable prowess thinking of how to accomplish his vow, recollected the mantras (given to him by Vyasa). And soon he was lulled in the arms of sleep. Unto that ape-bannered hero, burning with grief and immersed in thought, Kesava, having Garuda on his banner, appeared in a dream. Dhananjaya of righteous soul, in consequence of his love and veneration for Kesava, never omitted under any circumstances to stand up and advance a few steps for receiving Krishna. Rising up, therefore, now (in his dream), he gave unto Govinda a seat. He himself, however, at that time, did not set his heart upon taking his seat. Then Krishna, of mighty energy, knowing the resolution of Partha, said, while seated, unto the son of Kunti, these words while the latter was standing: “Do not set thy heart, O Partha, on grief. Time is unconquerable. Time forceth all creatures into the inevitable course. O foremost of men what for is this grief of thine? Grief should not be indulged in, O foremost of learned persons! Grief is an impediment to action. Accomplish that act which should be accomplished. The grief that maketh a person forgo all efforts is, indeed, O Dhananjaya, an enemy of that person. A person, by indulging in grief, gladdens his foes and saddens his friends, while the person is himself weakened. Therefore, it behoveth thee not to grieve.” Thus addressed by Vasudeva, the unvanquished Vibhatsu of great learning then said these words of grave import: “Grave is the vow that I have made about the slaughter of Jayadratha. Even tomorrow I shall slay that wicked wretch, that slayer of my son. Even this hath been my vow, O Kesava! For frustrating my vow, Jayadratha, protected by all the mighty car-warriors, will be kept in their rear by the Dhartarashtras. Their force, number, consists, O Madhava, of remnant, after slaughter, of eleven Akshauhinis of troops, difficult of being vanquished.