Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/15/13

तदा च गिरिजादेवी विरहं पुत्रसंभवम् ।। शंभुश्च परमं दुःखं प्राप तस्मिन्ननागते ।। १३ ।।

sanskrit

When he did not return, goddess Pārvatī felt severely the pangs of separation from her son. Śiva too was extremely miserable.

english translation

tadA ca girijAdevI virahaM putrasaMbhavam || zaMbhuzca paramaM duHkhaM prApa tasminnanAgate || 13 ||

hk transliteration by Sanscript