Markandeyapurana 77.13

Mārkaṇḍeya spoke:
Hence through that her husband’s curse Yama verily was born of her, and also Yamunā this famous and very great river. And it was with pain that Sañjñā, the noble lady, endured the Sun’s splendour; and then unable to bear the splendour she fell into thought—“What am I to do? Where am I to go? Where shall I go that I may find ease? And how shall the Sun, my husband, control his wrath?” So pondering in many ways, the Prajāpati’s illustrious daughter then thought much of actually taking refuge with her father. Thereupon the famous lady having resolved to go to her father’s house fashioned her body, that the Sun loved, in shadow-form, and addressed her shadow-self— “Remain thou here in the Sun’s house even as I; and behave thou becomingly to the children even as to the Sun And though questioned say nothing of this my going away; say always this, ‘I am she indeed, Sañjñā by name.’”

The Shadow-Sañjñā spoke:
“O lady, I will obey thy order and will so declare, as far as suffering my hair to be seized and as far as undergoing curses; it is performed indeed as far as drawing curses down upon my self.”