Srimad Bhagavatam Canto 07, Chapter 12, Text 19

SB 7.12.19

vanyais caru-purodasan
 nirvapet kala-coditan
labdhe nave nave ’nnadye
 puranam ca parityajet
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
A vanaprastha should prepare cakes to be offered in sacrifice from fruits and grains grown naturally in the forest. When he obtains some new grains, he should give up his old stock of grains.
Srimad Bhagavatam Canto 07, Chapter 12, Text 18
Srimad Bhagavatam Canto 07, Chapter 12, Text 20