Skandapurana 6.3.72.18

6.3.72.18

asatyā yadi me vāṇī kṛṣṇa uccaiḥśravā yadi .
tadāhaṃ tvadgṛhe dāsī bhavāmi sarpamātṛke .. 72.18 ..

if my statement is false, if Uccaiḥśravas is black;
then I shall become a slave in your house, mother of serpents.