Mbh 7.180.2a

“‘Vasudeva said, “Great is the joy I feel. Listen to me, Dhananjaya! This that I will tell thee will immediately dispel thy sorrow and infuse delight into thy heart. O thou of great splendour, know, O Dhananjaya, that Karna, his dart being baffled through Ghatotkacha, is already slain in battle. The man does not exist in this world that could not stay before Karna armed with that dart and looking like Kartikeya in battle. By good luck, his (natural) armour had been taken away. By good luck, his earrings also had been taken away. By good luck, his infallible dart also is now baffled, through Ghatotkacha. Clad in (natural) coat of mail and decked with his (natural) ear-rings, Karna, who had his senses under control, could singly vanquish the three worlds with the very gods. Neither Vasava, nor Varuna the lord of the waters, nor Yama, could venture to approach him. Indeed, if that bull among men had his armour and ear-rings, neither thyself, bending the Gandiva, nor myself, uplifting my discus, called Sudarsana, could vanquish him in battle. For thy good, Karna was divested of his ear-rings by Sakra with the help of an illusion. Similarly was that subjugator of hostile towns deprived of his (natural) armour. Indeed, because Karna, cutting off his (natural) armour and his brilliant ear-rings, gave them unto Sakra, it is for that he came to be called Vaikartana. Karna now seems to me to be like an angry snake of virulent poison stupefied by power of incantation, or like a fire of mild flames. From that time, O mighty-armed one, when the high-souled Sakra gave that dart unto Karna in exchange for the latter’s ear-rings, and celestial armour, that dart, viz., which has slain Ghatotkacha, from that time, Vrisha, having obtained it, had always regarded thee as slain in battle! But though deprived of that dart, O sinless one, I swear to thee that hero is still incapable of being slain by anybody else save thee.