Shiva Purana

siva.sh/siva-purana/saturda-samhita/7/3

रुद्रजाप्यमकार्षं वै परमध्यानमास्थितः ।। सरितश्चोत्तरे पुण्ये ह्येकचित्तः समाहितः ।। ३।।

sanskrit

He chanted the mantra of Rudra and became absorbed in supreme meditation The river is concentrated in the holy north with one mind.

english translation

rudrajApyamakArSaM vai paramadhyAnamAsthitaH || saritazcottare puNye hyekacittaH samAhitaH || 3||

hk transliteration by Sanscript