Mbh 12.33.3a

"'Vyasa said, "Remembering the duties of a Kshatriya, O king, do not give way to grief. All those Kshatriyas, O bull among Kshatriyas, have fallen in the observance of their proper duties. In the pursuit of great prosperity and of great fame on earth, those foremost of men, all of whom were liable to death,[109] have perished through the influence of Time. Thou hast not been their slayer, nor this Bhima, nor Arjuna, nor the twins. It is Time that took away their life-breaths according to the great law of change. Time hath neither mother, nor father, nor anybody for whom he is disposed to show any favour. He is the witness of the acts of all creatures. By him have they been taken away. This battle, O bull of Bharata's race, was only an occasion ordained by him. He causes creatures to be slain through the instrumentality of creatures. This is the manner in which it puts forth its irresistible power. Know that Time (in his dealings with creatures) is dependent upon the bond of action and is the witness of all actions good and bad. It is Time that brings about the fruits, fraught with bliss or woe, of our actions. Think, O mighty-armed one, of the acts of those Kshatriyas that have fallen. Those acts were the causes of their destruction and it is in consequence of them that they have perished. Think also of thy own acts consisting of observances of vows with restrained soul. And think also how thou hast been forced by the Supreme Ordainer to do such an act (as the slaughter of so many human beings). As a weapon made by a smith or carpenter is under the control of the person that is handling it, and moves as he moves it, similarly this universe, controlled by actions done in Time, moves as those actions move it. Seeing that the births and deaths of creatures take place without any (assignable) cause and in perfect wantonness, grief and joy are perfectly needless.