Mahabharata 12.49.44

12.49.44

tataḥ pitṛvadhāmarṣādrāmaḥ paramamanyumān |
niḥkṣatriyāṃ pratiśrutya mahīṃ śastramagṛhṇata || 44 ||

The princes, O bull of Bharata's race, seize and brought away the calf of Jamadagni's homa cow, without the knowledge of Kritavirya, the ruler of the Haihayas. For this reason a dispute took place between the high-souled Jamadagni (and the Haihayas). The puissant Rama, the son of Jamadagni, filled with wrath, lopped off the arms of Arjuna and brought back, O monarch, his sire's calf which was wandering within the inner enclosures of the king's palace. Then the foolish son of Arjuna, repairing together to the retreat of the high-souled Jamadagni, felled with the points of their lances, O king, the head of the Rishi from off his trunk while the celebrated Rama was out for fetching sacred fuel and grass. Inflamed with wrath at the death of his father and inspired with vengeance, Rama vowed to free the earth of Kshatriyas and took up arms. Then that tiger among the Bhrigus, possessed of great energy, putting forth his prowess, speedily slaughtered all the sons and grandsons of Kritavirya. Slaughtering thousands of Haihayas in rage, the descendent of Bhrigu, O king, made the earth miry with blood. Possessed of great energy, he quickly reft the earth of all Kshatriyas. Filled then with compassion, he retired into the woods. Afterwards, when some thousands of years had passed away, the puissant Rama, who was wrathful by nature, had imputations cast upon him (of cowardice).