Mbh 2.66.25a

“There was of old a chief of the Daityas of the name Prahlada. He had a son named Virochana. And Virochana, for the sake of obtaining a bride, quarrelled with Sudhanwan, the son of Angiras. It hath been heard by us that they mutually wagered their lives, saying--I am superior,--I am superior,--for the sake of obtaining a bride. And after they had thus quarrelled with each other, they both made Prahlada the arbitrator to decide between them. And they asked him, saying;--Who amongst us is superior (to the other)? Answer this question. Speak not falsely. Frightened at this quarrel, Prahlada cast his eyes upon Sudhanwan. And Sudhanwan in rage, burning like unto the mace of Yama, told him,--If thou answerest falsely, or dost not answer at all thy head will then be split into a hundred pieces by the wielder of the thunderbolt with that bolt of his.--Thus addressed by Sudhanwan, the Daitya, trembling like a leaf of the fig tree, went to Kasyapa of great energy, for taking counsel with him. And Prahlada said,--‘Thou art, O illustrious and exalted one, fully conversant with the rules of morality that should guide both the gods and the Asuras and the Brahmanas as well. Here, however, is a situation of great difficulty in respect of duty. Tell me, I ask thee, what regions are obtainable by them who upon being asked a question, answer it not, or answer it falsely. Kasyapa thus asked answered.--‘He that knoweth, but answereth not a question from temptation, anger or fear, casteth upon himself a thousand nooses of Varuna. And the person who, cited as a witness with respect to any matter of ocular or auricular knowledge, speaketh carelessly, casteth a thousand nooses of Varuna upon his own person. On the completion of one full year, one such noose is loosened. Therefore, he that knoweth, should speak the truth without concealment.