Srimad Bhagavatam Canto 07, Chapter 12, Text 18

SB 7.12.18

na krsta-pacyam asniyad
 akrstam capy akalatah
agni-pakvam athamam va
 arka-pakvam utaharet
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
A person in vanaprastha life should not eat grains grown by tilling of the fields. He should also not eat grains that have grown without tilling of the field but are not fully ripe. Nor should a vanaprastha eat grains cooked in fire. Indeed, he should eat only fruit ripened by the sunshine.
Srimad Bhagavatam Canto 07, Chapter 12, Text 17
Srimad Bhagavatam Canto 07, Chapter 12, Text 19