Mbh 1.37.4a

“Sauti continued, ‘Thus addressed all the offspring of Kadru assembled together, and, wise in counsels, submitted their opinions to one another. One party of the serpents said, ‘We should assume the guise of superior Brahmanas, and beseech Janamejaya, saying, ‘This (intended) sacrifice of yours ought not to take place.’ Other snakes thinking themselves wise, said, ‘We should all become his favourite counsellors. He will then certainly ask for our advice in all projects. And we will then give him such advice that the sacrifice may be obstructed. The king, the foremost of wise men, thinking us of sterling worth will certainly ask us about his sacrifice. We will say, ‘It must not be!’ And pointing to many serious evils in this and the next worlds, we will take care that the sacrifice may not take place. Or, let one of the snakes, approaching, bite the person who, intending the monarch’s good, and well-acquainted with the rites of the snake-sacrifice, may be appointed as the sacrificial priest, so that he will die. The sacrificial priest dying, the sacrifice will not be completed. We will also bite all those who, acquainted with the rites of the snake-sacrifice, may be appointed Ritwiks of the sacrifice, and by that means attain our object.’ Other snakes, more virtuous and kind, said, ‘O, this counsel of yours is evil. It is not meet to kill Brahmanas. In danger, that remedy is proper, which is blessed on the practices of the righteous. Unrighteousness finally destroyeth the world.’ Other serpents said, ‘We will extinguish the blazing sacrificial fire by ourselves becoming clouds luminous with lightning and pouring down showers.’ Other snakes, the best of their kind, proposed, ‘Going, by night, let us steal away the vessel of Soma juice. That will disturb the rite. Or, at that sacrifice, let the snakes, by hundreds and thousands, bite the people, and spread terror around. Or, let the serpents defile the pure food with their food-defiling urine and dung.’