The Great Epic of the Bhārata dynasty 1.57.70

1.57.70

sa mātaramupasthāya tapasyeva mano dadhe |
smṛto'haṃ darśayiṣyāmi kṛtyeṣviti ca so'bravīt || 70 ||

"And Satyavati gratified with having obtained the excellent boon in consequence of which she became sweet-scented and her virginity remained unsullied conceived through Parasara's embraces. And she brought forth the very day, on an island in the Yamuna, the child begot upon her by Parasara and gifted with great energy. And the child, with the permission of his mother, set his mind on asceticism. And he went away saying, 'As soon as thou rememberest me when occasion comes, I shall appear unto thee.'