Mahabharata 8.66.22

8.66.22

sa evamukto madhusūdanena gāṇḍīvadhanvā ripuṣūgradhanvā |
uvāca ko nveṣa mamādya nāgaḥ svayaṃ ya āgādgaruḍasya vaktram || 22 ||

If the wielder of the thunderbolt himself were to protect Partha, the latter would still have to go to the domains of the king of the pitris. Do not disregard me. Do my bidding. I will slay thy foe. Shoot me without delay." Hearing those words, Karna said, "Karna, O snake, never desires to have victory in battle today by relying on another's might. Even if I have to slay a hundred Arjunas, I will not, O snake, still shoot the same shaft twice." Once more addressing him in the midst of battle, that best of men, viz., Surya's son, Karna, said, "Aided by the nature of my other snaky weapons, and by resolute effort and wrath, I shall slay Partha. Be thou happy and go elsewhere." Thus addressed, in battle, by Karna, that prince of snakes, unable from rage to bear those words, himself proceeded, O king, for the slaughter of Partha, having assumed the form of an arrow. Of fierce form, the desire he ardently cherished was the destruction of his enemy. Then Krishna, addressing Partha in that encounter, said into him, "Slay that great snake inimical to thee." Thus addressed by the slayer of Madhu, the wielder of Gandiva, that bowman who was always fierce unto foes, enquired of him, saying, "Who is that snake that advanceth of his own accord against me, as if, indeed he advanceth right against the mouth of Garuda?" Krishna replied, "Whilst thou, armed with bow, wert engaged at Khandava in gratifying the god Agni, this snake was then in the sky, his body ensconced within his mother's.