The Great Epic of the Bhārata dynasty 3.97.24

3.97.24

tasya putro'bhavadṛṣeḥ sa tejasvī mahānṛṣiḥ |
sa bāla eva tejasvī pitustasya niveśane |
idhmānāṃ bhāramājahre idhmavāhastato'bhavat || 24 ||

"Lomasa continued, 'Saying, 'So be it,' that pious Muni thereupon knew his devout wife of equal behaviour. And after she had conceived, he retired into the forest. And after the Muni had gone away, the foetus began to grow for seven years. And after the seventh year had expired, there came out of the womb, the highly learned Dridhasyu, blazing, O Bharata, in his own splendour. And the great Brahmana and illustrious ascetic, endued with mighty energy, took his birth as the Rishi's son, coming out of the womb, as if repeating the Vedas with the Upanishads and the Angas. Endued with great energy while yet a child, he used to carry loads of sacrificial fuel into the asylum of his father, and was thence called Idhmavaha (carrier of sacrificial wood). And the Muni, beholding his son possessed of such virtues, became highly glad.