Srimad Bhagavatam Canto 07, Chapter 12, Text 20

SB 7.12.20

agny-artham eva saranam
 utajam vadri-kandaram
srayeta hima-vayv-agni-
 varsarkatapa-sat svayam
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
A vanaprastha should prepare a thatched cottage or take shelter of a cave in a mountain only to keep the sacred fire, but he should personally practice enduring snowfall, wind, fire, rain and the shining of the sun.
Srimad Bhagavatam Canto 07, Chapter 12, Text 19
Srimad Bhagavatam Canto 07, Chapter 12, Text 21