Shiva Purana

siva.sh/siva-purana/saturda-samhita/1/20

जपित्वा तु महादेवीं सर्वलोकनमस्कृताम्।। प्रसन्नस्तु महादेवो ध्यानयुक्तेन चेतसा।।२०।।

sanskrit

On seeing him engrossed in meditation and realising that Being as Śiva, the Creator bowed to him after performing the Japa of Śiva-Gāyatrī, who is the great goddess, bowed to by all the worlds. The great god was delighted with the mind in contemplation.

english translation

japitvA tu mahAdevIM sarvalokanamaskRtAm|| prasannastu mahAdevo dhyAnayuktena cetasA||20||

hk transliteration by Sanscript