Shiva Purana

siva.sh/siva-purana/saturda-samhita/13/61

प्रातरुत्थाय सुस्नातो लिंगमभ्यर्च्य शाम्भवम् ।। वर्षं जपन्निदं स्तोत्रमपुत्रः पुत्रवान्भवेत् ।। ६१ ।।

sanskrit

If an issueless man gets up early in the morning, takes his bath, worships Śiva’s phallic image, recites this hymn and continues the practice for a year, he will surely secure a son.

english translation

prAtarutthAya susnAto liMgamabhyarcya zAmbhavam || varSaM japannidaM stotramaputraH putravAnbhavet || 61 ||

hk transliteration by Sanscript