Mbh 8.69.4b

Thus adjured, Kausika told them the truth, saying, 'Those men have entered this wood crowded with many trees and creepers and plants'. Even thus, O Partha, did Kausika give them the information. Then those cruel men, it is heard, finding out the persons they sought, slew them all. In consequence of that great sin consisting in the words spoken, Kausika, ignorant of the subtilities of morality, fell into a grievous hell, even as a foolish man, of little knowledge, and unacquainted with the distinctions of morality, falleth into painful hell by not having asked persons of age for the solution of his doubts. There must be some indications for distinguishing virtue from sin. Sometimes that high and unattainable knowledge may be had by the exercise of reason. Many persons say, on the one hand, that the scriptures indicate morality. I do not contradict this. The scriptures, however, do not provide for every case. For the growth of creatures have precepts of morality been declared. That which is connected with inoffensiveness is religion. Dharma protects and preserves the people. So it is the conclusion of the Pandits that what maintains is Dharma. O Partha, I have narrated to you the signs and indications of Dharma. Hearing this, you decide whether Yudhishthira is to be slaughtered by you or not." Arjuna said, "Krishna, your words are fraught with great intelligence and impregnated with wisdom. Thou art to us like our parents and our refuge. Nothing is unknown to thee in the three worlds, so thou art conversant with the canons of morality. O Keshava of the Vrishni clan, thou knowest my vow that whoever among men would tell me, 'Partha, give thy Gandiva to some one braver than you,' I shall at once put an end to his life. Bhima has also made a promise that whoever would call him 'tularak', would be slaughtered by him there and then. Now the King has repeatedly used those very words to me in thy presence, O hero, viz., 'Give thy bow.