Shiva Purana

siva.sh/siva-purana/saturda-samhita/6/14

किन्तु देवेश्वरो रुद्रः प्रसीदति महेश्वरः ।। सुदुर्लभो मृत्युहीनस्तव पुत्रो ह्ययोनिजः ।। १४ ।।

sanskrit

But if Śiva, the lord of the gods, becomes delighted, even an immortal son not born of a womb, though hard to get, may be obtained.

english translation

kintu devezvaro rudraH prasIdati mahezvaraH || sudurlabho mRtyuhInastava putro hyayonijaH || 14 ||

hk transliteration by Sanscript