Mbh 6.107.2a

“Then that delighter of the Yadavas, beholding the Pandava army breaking, reined the excellent car (that he guided), and addressing Vibhatsu the son of Pritha, said,--‘That hour is come, O Partha, which thou hadst hoped for. Strike now, O tiger among men, or thou wilt be deprived of thy senses. Formerly, O hero, thou saidst, O Partha, in that conclave of kings in Virata’s city, in the presence also of Sanjaya, these words:--“I will slay all the warriors of Dhritarashtra’s son, all of them with their followers, including, Bhishma and Drona, that would fight with me in battle”--O son of Kunti, O chastiser of foes, make those words of thine true. Remembering the duty of a Kshatriya, fight, without any anxiety.’ Thus addressed by Vasudeva, Arjuna hung down his head and looked askance at him. And Vibhatsu replied very unwillingly, saying, ‘To acquire sovereignty with hell in the end, having slain those who should not be slain, or the woes of an exile in the woods,--(these are the alternatives). Which of these should I achieve? Urge the steeds, O Hrishikesa, I will do thy bidding. I will overthrow the Kuru grandsire Bhishma, that invincible warrior.’--Thus asked, Madhava urged those steeds of a silvery hue, to the spot where Bhishma, incapable of being looked at like the Sun himself, was staying. Then that large host of Yudhishthira rallied and came again to the fight, beholding the mighty-armed Partha proceeding for an encounter with Bhishma. Then Bhishma that foremost one among the Kurus, repeatedly roared like a lion. And he soon covered Dhananjaya’s car with a shower of arrows. Within a trice that car of his with its steeds and charioteer, became entirely invisible in consequence of that thick shower of arrows. Vasudeva, however, without fear, mustering patience, and endued with great activity, urged those steeds mangled with Bhishma’s shafts.