The Great Epic of the Bhārata dynasty 1.76.33

1.76.33

vahasva bhāryāṃ dharmeṇa devayānīṃ sumadhyamām |
anayā saha saṃprītimatulāṃ samavāpsyasi || 33 ||

"Yayati then said, 'I solicit the boon, O Brahmana, that by so doing, the sin of begetting a half-breed might not touch me.' Sukra, however, assured him by saying, 'I shall absolve thee from the sin. Ask thou the boon that thou desirest. Fear not to wed her. I grant thee absolution. Maintain virtuously thy wife--the slender-waisted Devayani. Transports of happiness be thine in her company. This other maiden, Vrishaparvan's daughter, Sarmishtha should ever be regarded by thee. But thou shall not summon her to thy bed.'