Skandapurana 5.24.26

5.24.26

pañcāgnisādhako grīṣme varṣāsvākāśamāśritaḥ ..
jalāśrayaśca hemaṃta ekaḥ syātpuruṣaḥ kṣitau .. 26 ..

One man on earth may practice the five fires in summer, / dwell in the open air in the rains, and stay in water in winter;