Mbh 3.115.6a

“Bhrigu said, ‘During the days that your season lasts, thou and thy mother must take a bath, with the ceremony for bringing forth a male child. And ye two must then separately embrace two different trees--she a peepal tree, and thou a fig tree. And, O dutiful girl, here are two pots of rice and milk, prepared by me with the utmost care. I having ransacked the whole universe to find the drugs, the essence whereof hath been blended with this milk and rice. It must be taken as food with the greatest care.’ And saying this, he vanished from sight. The two ladies, however, made an interchange both in the matter of the pots of rice, and likewise as regards the trees (to be embraced by each). Then after the lapse of very many days, the revered saint, once more came. And he came knowing (what had happened) by his attribute of divine knowledge. Then Bhrigu possessed of mighty strength, spake to Satyavati, his daughter-in-law, saying, ‘O dutiful girl! O my daughter of a lovely brow, the wrong pot of rice thou tookest as food. And it was the wrong tree which was embraced by thee. It was thy mother who deluded thee. A son will be born of thee, who, though of the priestly caste, will be of a character fit for the military order; while a mighty son will be born of thy mother, who, though by birth a Kshatriya will assume a life suitable to the sacerdotal order. And his power will be great, and he will walk on the path trodden by righteous men.’ Then she entreated her father-in-law again and again, saying, ‘Let not my son be of this character; but let my grandson be such.’ And, O Pandu’s son, he replied, ‘So let it be!’ And thus he was pleased to grant her prayer. Then she brought forth on the expected day a son by name Jamadagni. And this son of Bhrigu was endowed with both splendour and grace. And he grew in years and in strength, and excelled he other saints in the proficiency of his Vaidik lore.