Shiva Purana
देव्युवाच ॥ उभयोर्युवयोर्मध्ये वटुको यो भवेन्मम ॥ तस्य स्याद्विजयो नित्यं नात्र कार्या विचारणा ॥ ५४ ॥
The Goddess said:— Between you two whoever becomes my Vaṭuka shall be victorious. No doubt need be entertained in this respect.
english translation
devyuvAca ॥ ubhayoryuvayormadhye vaTuko yo bhavenmama ॥ tasya syAdvijayo nityaM nAtra kAryA vicAraNA ॥ 54 ॥
hk transliteration by Sanscript