Revākhaṇḍa ascribed to the Vāyupurāṇa (RKV) 150.12

150.12

gatvā tatra mahādevaṃ tapaścaraṇatatparam /
kṣobhayadhvaṃ yathānyāyaṃ gaṅgāsāgaravāsinam //

“Having gone there, agitate Mahādeva, who is intent on the practice of austerities, / dwelling at the confluence of the Gaṅgā and the ocean, in the appropriate manner.”