Mahabharata 1.18.2

1.18.2

yaṃ niśāmya tadā kadrūrvinatāmidamabravīt |
uccaiḥśravā nu kiṃvarṇo bhadre jānīhi māciram || 2 ||

"Sauti said, 'Thus have I recited to you the whole story of how Amrita was churned out of the Ocean, and the occasion on which the horse Uchchaihsravas of great beauty and incomparable prowess was obtained. It was this horse about which Kadru asked Vinata, saying, 'Tell me, amiable sister, without taking much time, of what colour Uchchaishravas is.' And Vinata answered, 'That prince of steeds is certainly white. What dost thou think, sister? Say thou what is its colour. Let us lay a wager upon it.' Kadru replied, then, 'O thou of sweet smiles. I think that horse is black in its tail. Beauteous one, bet with me that she who loseth will become the other's slave.'