Revākhaṇḍa of the Skandapurāṇa manuscripts (RKS) 97.21

97.21

śrutaṃ sarvais tathā vākyaṃ sarpair mātṛpaṇas tadā /
jātā dāsī na sandehaḥ śveto bhāskaravāhanaḥ //

Then that speech, the mother's wager, was heard by all the serpents: / 'I have become a servant, no doubt; the mount of the sun is white!'