Varaha Purana 166.21

तत्र कृत्वा च हैरण्याः मूर्त्तयश्च चतुर्विधाः ॥ तीर्थे वराहसंज्ञे तु मथुरायां व्यवस्थिताः ।

tatra kṛtvā ca hairaṇyāḥ mūrttayaś ca caturvidhāḥ || tīrthe varāhasaṁjñe tu mathurāyāṁ vyavasthitāḥ |

There, having fashioned golden images of four kinds, they were established in Mathurā, at the sacred ford (tīrtha) named “Varāha”.