Kadru and Vinata Wager on the Horse's Tail
The sisters Kadru and Vinata see the divine horse Ucchaihshrava emerge from the ocean. When Kadru asks its colour, Vinata says it is white, but Kadru claims its tail is black. They stake their freedom on it, agreeing to check the next day.
The churning of the ocean had produced many wonders, and among them was the divine horse Ucchaihshrava, unparalleled in strength and beauty. When the sisters Kadru and Vinata saw it, Kadru turned to Vinata with a question.
"My dear, what is the colour of Ucchaihshrava? Tell me right away."
Vinata replied, "Blessed one, the king of horses is white." Then she turned the question back. "What colour do you think it is? Tell me what you think and we will have a wager."
Kadru did not hesitate. "O lady of the sweet smiles! I think the horse has a black tail." She pressed the point. "O beautiful one! Let us have a wager that she whose words are false will become the other one's slave."
The terms were set. The one proven wrong would lose her freedom. Having laid this wager, they returned to their home, resolving to examine the horse the next day and see whose eyes told the truth.