Matsyapurana 11.7

11.7

apatyāni madīyāni mātṛsnehena pālaya
tathetyuktvā tu sā devam agamat kvāpi suvratā //

Saṃjñâ also gave birth to Yama and a girl called, Yamunâ, who were twins. When Saṃjñâ could not bear the power of the Sun, she produced from her body a lady known as Chhâyâ (shadow). Seeing Chhâyâ standing face to face, Saṃjñâ directed her to serve her master and also to take motherly care of her progeny. On Chhâyâ's agreeing to carry out her injunctions, Saṃjñâ went away somewhere.—4-7.