Shiva Purana
विश्वरूपं दधद्विष्णुर्दधीचेन महर्षिणा ॥ युध्यता समुपालब्धस्तद्रूपं दधता स्वयम् ॥ १६ ॥
While Viṣṇu who had assumed the cosmic form was fighting with Dadhīca the latter assumed the cosmic form of Viṣṇu.
english translation
vizvarUpaM dadhadviSNurdadhIcena maharSiNA ॥ yudhyatA samupAlabdhastadrUpaM dadhatA svayam ॥ 16 ॥
hk transliteration by Sanscript