Mahabharata 13.18.7

13.18.7

vālmīkiścāpi bhagavānyudhiṣṭhiramabhāṣata |
vivāde sāmni munibhirbrahmaghno vai bhavāniti |
uktaḥ kṣaṇena cāviṣṭastenādharmeṇa bhārata || 7 ||

As the reward of those penances, I obtained from Sarva, O son of king Pandu, a hundred sons, all of whom were born without the intervention of woman, of well-restrained soul, conversant with righteousness, possessed of great splendour, free from disease and sorrow, and endued with lives extending over a hundred thousand years--Then the illustrious Valmiki, addressing Yudhishthira, said,--Once upon a time, in course of a dialectical disputation, certain ascetics that were possessors of the homa fire denounced me as one guilty of Brahmanicide. As soon as they had denounced me as such, the sin of Brahmanicide, O Bharata, possessed me. I then, for cleansing myself, sought the protection of the sinless Isana who is irresistible in energy. I become cleansed of all my sins. That dispeller of all sorrows, viz., the destroyer of the triple city of the Asuras, said unto me,--Thy fame shall be great in the world--Then Jamadagni's son, that foremost of all righteous persons, shining like the Sun with blazing splendour in the midst of that conclave of Rishis, said unto the son of Kunti these words;--I was afflicted with the sin, O eldest son of Pandu, of Brahmanicide for having slain my brothers who were all learned Brahmanas. For purifying myself, I sought the protection, O king, of Mahadeva. I hymned the praises of the great Deity by reciting his names. At this, Bhava became gratified with me and gave me a battle-axe and many other celestial weapons.