Mbh 3.116.1b

And then Rama, the slayer of hostile heroes, came to the hermitage, last of all. Him the mighty-armed Jamadagni, of great austerities, addressed, saying, ‘Kill this wicked mother of thine, without compunction, O my son.’ Thereupon Rama immediately took up an axe and therewith severed his mother’s head. Then, O great king, the wrath of Jamadagni of mighty soul, was at once appeased; and well-pleased, he spake the following words, ‘Thou hast, my boy, performed at my bidding this difficult task, being versed in virtue. Therefore, whatsoever wishes there may be in thy heart, I am ready to grant them all. Do thou ask me.’ Thereupon Rama solicited that his mother might be restored to life, and that he might not be haunted by the remembrance of this cruel deed and that he might not be affected by any sin, and that his brothers might recover their former state, and that he might be unrivalled on the field of battle, and that he might obtain long life. And, O Bharata’s son, Jamadagni, whose penances were the most rigid, granted all those desires of his son. Once, however, O lord, when his sons had gone out as before, the valourous son of Kartavirya, the lord of the country near the shore of the sea, came up to the hermitage. And when he arrived at that hermitage, the wife of the saint received him hospitably. He, however, intoxicated with a warrior’s pride, was not at all pleased with the reception accorded to him, and by force and in defiance of all resistance, seized and carried off from that hermitage the chief of the cows whose milk supplied the sacred butter, not heeding the loud lowing of the cow. And he wantonly pulled down the large trees of the wood. When Rama came home, his father himself told him all that had happened. Then when Rama saw how the cow was lowing for its calf, resentment arose in his heart. And he rushed towards Kartavirya’s son, whose last moments had drawn nigh.