Matsya Purana 194.28

194.28

haṃsayuktena yānena rudralokaṃ sa gacchati.
yāvaccandraśca sūryaśca himavāṃśca mahodadhiḥ .. 194.27

One who worships Śiva and drinks the water of the sacred Narmadâ never fares ill He goes to Rudraloka seated in a Vimâna and resides in heaven till the existence of the Moon, the Sun, the Himâlaya the ocean, and the Ganges One who keeps up a fast there is never subjected to the trial of births Afterwards Âsadhî tîrtha should be visited, by bathing where one becomes entitled to occupy half the throne of Indra by his side Then Strî tîrtha the dispeller of all ills should be visited, by bathing where one undoubtedly becomes Gaṇeśvara The confluence of Eraṇḍî and the Narmadâ is renowned in all the three worlds where by bathing and observing a fast one becomes freed from the sins of having killed a Brâhmaṇa Then the sacred Jâmadagnya at the confluence of the Narmadâ and the ocean should be visited There Lord Janârdana attained siddhi and Indra became the Lord of the Devas by performing a series of sacrifices One who bathes there gets three times the benefits of having performed the Aśvamedha sacrifice—26 35