Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/10/24

अद्यप्रभृति नारीषु यदा त्वं संगतो भवेः ।। तदा मृतिस्तवेत्युक्त्वा विवेश ज्वलनं सती ।। २४ ।।

sanskrit

The chaste lady entered fire after proclaiming “From now onwards if you become united with any woman in sexual embrace you will die.”

english translation

adyaprabhRti nArISu yadA tvaM saMgato bhaveH || tadA mRtistavetyuktvA viveza jvalanaM satI || 24 ||

hk transliteration by Sanscript