Srimad-Bhagavatam: Canto 7 - Chapter 1 - Verse 18
Sanskrit:
न कृष्टपच्यमश्नीयादकृष्टं चाप्यकालत: ।अग्निपक्वमथामं वा अर्कपक्वमुताहरेत् ॥ १८ ॥
ITRANS:
na kṛṣṭa-pacyam aśnīyādakṛṣṭaṁ cāpy akālataḥagni-pakvam athāmaṁ vāarka-pakvam utāharet
Translation:
A person in vānaprastha 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 vānaprastha eat grains cooked in fire. Indeed, he should eat only fruit ripened by the sunshine.