Mbh 3.191.3c

And accordingly when frogs began to be terribly slaughtered, the affrighted frogs represented all that had happened unto their king, and the king of the frogs assuming the garb of an ascetic came before the king Parikshit, and having approached the monarch, he said, ‘O king, give not thyself up to wrath! Be inclined to grace. It behoveth thee not to slay the innocent frogs.’ Here occurs a couple of Slokas. (They are these):--‘O thou of unfading glory, slay not the frogs! Pacify thy wrath! The prosperity and ascetic merits of those that have their souls steeped in ignorance suffer diminution! Pledge thyself not to be angry with the frogs! What need hast thou to commit such sin! What purpose will be served by slaying the frogs!’ Then king Parikshit whose soul was filled with woe on account of the death of her that was dear to him, answered the chief of the frogs who had spoken to him thus, ‘I will not forgive the frogs. On the other hand, I will slay them. By these wicked wretches hath my dear one been swallowed up. The frogs, therefore, always deserve to be killed by me. It behoveth thee not, O learned one, to intercede on their behalf.’ And hearing these words of Parikshit, the king of the frogs with his senses and mind much pained said, ‘Be inclined to grace, O king! I am the king of the frogs by name Ayu. She who was thy wife is my daughter of the name of Susobhana. This, indeed, is an instance of her bad conduct. Before this, many kings were deceived by her.’ The king thereupon said to him, ‘I desire to have her. Let her be granted to me by thee!’ The king of the frogs thereupon bestowed his daughter upon Parikshit, and addressing her said, ‘Wait upon and serve the king.’ And having spoken these words to his daughter, he also addressed her in wrath saying, ‘Since thou hast deceived many Kings for this untruthful behaviour of thine, thy offspring will prove disrespectful to Brahmanas!’