Shiva Purana

siva.sh/siva-purana/rudra-samhita/189/57

गिरिजोवाच ।। यतो मम स्वरूपं वै धृतभूषे सखि त्वया ।। सकामत्वेन समये संप्राप्ते सति मानिनि ।।५७।।

sanskrit

Pārvatī said : O friend Ūṣā, chaste and honourable lady since you have adopted my form out of passion, so you will have the monthly course in the appropriate time in the Kārttika month.

english translation

girijovAca || yato mama svarUpaM vai dhRtabhUSe sakhi tvayA || sakAmatvena samaye saMprApte sati mAnini ||57||

hk transliteration by Sanscript