Matsyapurana 49.20

49.20

evamukto 'bravīdenāṃ svayameva bṛhaspatiḥ
nopadeṣṭavyo vinayas tvayā me varavarṇini //

Sûta said :—Bṛihaspati, whilst staying on Earth, one day saw the wife of his brother, Uśija, who was big with child, and addressed her thus :—"Dress thyself well and let us enjoy." She, being thus addressed, replied to Bṛihaspati thus :—"The embryo in my womb is mature and is already reciting the Vedas. Thy seed will also not be fruitless and thy proposal is sinful." Hearing which, Bṛihaspati said :—"I need not be taught morality by thee, O sweet one." After saying that, he carried out his desire by force ; when on the verge of his final enjoyment, the child from her womb cried out to Bṛihaspati :—"I have entered the womb first, O Bṛihaspati, thy seed will also not go in vain. There is no room for a second body in this womb." Bṛihaspati being thus addressed by the child in the womb, replied in anger :—"Because on such an occasion, dear to every creature, thou preventest me from enjoyment, thou shouldst see lasting darkness [Dîrghatamas]."—17-23.