Skandapurana 5.270.2

5.270.2

dīrghāyurjāyate martyaḥ sarvarogavivarjitaḥ..
mārkaṇḍeśvara ityuktastatra devo maheśvaraḥ..2..

a mortal becomes long-lived and free of all diseases.
The god Maheśvara there is called Mārkaṇḍeśvara;