Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/7/6

अथ सा द्विजपत्नी हि ब्रह्मचर्य्यव्रतान्विता ।। पार्थिवार्चनपूर्वं हि तपस्तेपे सुदारुणम् ।। ६ ।।

sanskrit

Then the brahmin widow, observing the rite of celibacy performed a severe penance by worshipping Śiva’s earthen phallic image.

english translation

atha sA dvijapatnI hi brahmacaryyavratAnvitA || pArthivArcanapUrvaM hi tapastepe sudAruNam || 6 ||

hk transliteration by Sanscript